文档库 最新最全的文档下载
当前位置:文档库 › o高考英语真题汇编 阅读理解科普类说明文解析(原卷版)

o高考英语真题汇编 阅读理解科普类说明文解析(原卷版)

o高考英语真题汇编 阅读理解科普类说明文解析(原卷版)
o高考英语真题汇编 阅读理解科普类说明文解析(原卷版)

2015-2017年高考英语分项解析精编版专题16

科普类说明文

2017高考题

科普知识类

[2017·北京卷]

D

Hollywood's theory that machines with evil(邪恶的) minds will drive armies of killer robots is just silly. The real problem relates to the possibility that artificial intelligence(AI) may become extremely good at achieving something other than what we really want. In 1960 a well-known mathematician Norbert Wiener, who founded the field of cybernetics(控制论), put it this way: ―If we use, to achieve our purposes, a mechanical agency with whose operation we cannot effectively interfere(干预), we had better be quite sure that the purpose put into the machine is the purpose which we really desire.‖

A machine with a specific purpose has another quality, one that we usually associate with living things: a wish to preserve its own existence. For the machine, this quality is not in-born, nor is it something introduced by humans; it is a logical consequence of the simple fact that the machine cannot achieve its original purpose if it is dead. So if we send out a robot with the single instruction of fetching coffee, it will have a strong desire to secure success by disabling its own off switch or even killing anyone who might interfere with its task. If we are not careful, then, we could face a kind of global chess match against very determined, super intelligent machines whose objectives conflict with our own, with the real world as the chessboard.

The possibility of entering into and losing such a match should concentrate the minds of computer scientists. Some researchers argue that we can seal the machines inside a kind of firewall, using them to answer difficult questions but never allowing them to affect the real world. Unfortunately, that plan seems unlikely to work: we have yet to invent a firewall that is secure against ordinary humans, let alone super intelligent machines.

Solving the safety problem well enough to move forward in AI seems to be possible but not easy. There are probably decades in which to plan for the arrival of super intelligent machines. But the problem should not be dismissed out of hand, as it has been by some AI researchers. Some argue that humans and machines can coexist as long as they work in teams—yet that is not possible unless machines share the goals of humans. Others say we can just ―switch them off‖ as if super intelligent machines are too stupid to think of that possibility. Still others think that super intelligent AI will never happen. On September 11, 1933, famous physicist Ernest Rutherford stated, with confidence, ―Anyone who expects a source of power in the transformation of these atoms is talking moonshine.‖ However, on September 12, 1933, physicist Leo Szilard invented the neutron-induced(中子诱导) nuclear chain reaction.

67.Paragraph 1 mainly tells us that artificial intelligence may ________.

A.run out of human control

B.satisfy human's real desires

C.command armies of killer robots

D.work faster than a mathematician

68.Machines with specific purposes are associated with living things partly because they might be able to ________.

A.prevent themselves from being destroyed

B.achieve their original goals independently

C.do anything successfully with given orders

D.beat humans in international chess matches

69.According to some researchers, we can use firewalls to ________.

A.help super intelligent machines work better

B.be secure against evil human beings

C.keep machines from being harmed

D.avoid robots' affecting the world

70.What does the author think of the safety problem of super intelligent machines?

A.It will disappear with the development of AI.

B.It will get worse with human interference.

C.It will be solved but with difficulty.

D.It will stay for a decade.

[2017·江苏卷]

B

Before birth,babies can tell the difference between loud sounds and voices. They can even distinguish their mother's voice from that of a female stranger. But when it comes to embryonic learning (胎教),birds could rule the roost. As recently reported in The Auk:Ornithological Advances,some mother birds may teach their young to sing even before they hatch (孵化). New-born chicks can then imitate their mum's call within a few days of entering the world.

This educational method was first observed in 2012 by Sonia Kleindorfer,a biologist at Flinders

University in South Australia,and her colleagues. Female Australian superb fairy wrens were found to repeat

one sound over and over again while hatching their eggs. When the eggs were hatched,the baby birds made

the similar chirp to their mothers—a sound that served as their regular ―feed me!‖ call.

To find out if the special quality was more widespread in birds,the researchers sought the red-backed

fairy wren,another species of Australian songbird. First they collected sound data from 67 nests in four sites in

Queensland before and after hatching. Then they identified begging calls by analysing the order and number of

notes. A com puter analysis blindly compared calls produced by mothers and chicks,ranking them by

similarity.

It turns out that baby red-backed fairy wrens also emerge chirping like their mums. And the more frequently mothers had called to their eggs,the more similar were the babies' begging calls. In addition,the team set up a separate experiment that suggested that the baby birds that most closely imitated their mum's voice were rewarded with the most food.

This observation hints that effective embryonic learning could signal neurological (神经系统的) strengths of children to parents. An evolutionary inference can then be drawn. ―As a parent,do you invest in quality children,or do you invest in children that are in need?‖Kleindorfer asks. ―Our results suggest that they might be going for quality.‖

58.The underlined phrase in Paragraph 1 means ―________‖.

A.be the worst B.be the best

C.be just as bad D.be just as good

59.What are Kleindorfer's findings based on?

A.Similarities between the calls of mums and chicks.

B.The observation of fairy wrens across Australia.

C.The data collected from Queensland's locals.

D.Controlled experiments on wrens and other birds.

60.Embryonic learning helps mother birds to identify the baby birds which ________.

A.can receive quality signals

B.are in need of training

C.fit the environment better

D.make the loudest call

[2017·江苏卷]

D

Old problem,new approaches

While clean energy is increasingly used in our daily life,global warming will continue for some decades after CO2 emissions (排放) peak. So even if emissions were to begin to decrease today,we would still face the challenge of adapting to climate change. Here I will stress some smarter and more creative examples of climate adaptation.

When it comes to adaptation,it is important to understand that climate change is a process. We are therefore not talking about adapting to a new standard,but to a constantly shifting set of conditions. This is why, in part at least,the US National Climate Assessment says that:―There is no ?one-size fits all‘ adaptation.‖ Nevertheless,there are some actions that offer much and carry little risk or cost.

Around the world, people are adapting in surprising ways,especially in some poor countries. Floods have become more damaging in Bangladesh in rece nt decades. Mohammed Rezwan saw opportunity where others saw only disaster. His not-for-profit organization runs 100 river boats that serve as floating libraries,schools,and health clinics,and are equipped with solar panels and other communicating facilities. Rezwan is creating floating connectivity(连接) to replace flooded roads and highways. But he is also working at a far more fundamental level:his staff show people how to make floating gardens and fish ponds to prevent starvation during the wet season.

Elsewhere in Asia even more astonishing actions are being taken. Chewang Norphel lives in a mountainous region in India, where he is known as the Ice Man. The loss of glaciers (冰川) there due to global warming represents an enormous threat to agriculture. Without the glaciers, water will arrive in the rivers at times when it can damage crops. Norphel's inspiration came from seeing the waste of water over winter, when it was not needed. He directed the wasted water into shallow basins where it froze, and was stored until the spring. His fields of ice supply perfectly timed irrigation(灌溉) water. Having created nine such ice reserves, Norphel calculates that he has stored about 200,000m3 of water. Climate change is a continuing process, so Norphel's ice reserves will not last forever. Warming will overtake them. But he is providing a few years during which the farmers will, perhaps, be able to find other means of adapting.

Increasing Earth's reflectiveness can cool the planet. In southern Spain the sudden increase of greenhouses (which reflect light back to space) has changed the warming trend locally, and actually cooled the region. While Spain as a whole is heating up quickly, temperatures near the greenhouses have decreased. This example should act as an inspiration for all cities. By painting buildings white, cities may slow down the warming process.

In Peru, local farmers around a mountain with a glacier that has already fallen victim to climate change have begun painting the entire mountain peak white in the hope that the added reflectiveness will restore the life-giving ice. The outcome is still far from clear. But the World Bank has included the project on its list of ―100 ideas to save the planet‖.

More ordinary forms of adaptation are happening everywhere. A friend of mine owns an area of land in western Victoria. Over five generations the land has been too wet for cropping. But during the past decade declining rainfall has allowed him to plant highly profitable crops. Farmers in many countries are also adapting like this—either by growing new produce, or by growing the same things differently. This is common sense. But some suggestions for adapting are not. When the polluting industries argue that we've lost the battle to control carbon pollution and have no choice but to adapt, it's a nonsense designed to make the case for business as usual.

Human beings will continue to adapt to the changing climate in both ordinary and astonishing ways. But the most sensible form of adaptation is surely to adapt our energy systems to emit less carbon pollution. After all, if we adapt in that way, we may avoid the need to change in so many others.

65.The underlined part in Paragraph 2 implies ________.

A.adaptation is an ever-changing process

B.the cost of adaptation varies with time

C.global warming affects adaptation forms

D.adaptation to climate change is challenging

66.What is special with regard to Rezwan's project?

A.The project receives government support.

B.Different organizations work with each other.

C.His organization makes the best of a bad situation.

D.The project connects flooded roads and highways.

67.What did the Ice Man do to reduce the effect of global warming?

A.Storing ice for future use.

B.Protecting the glaciers from melting.

C.Changing the irrigation time.

D.Postponing the melting of the glaciers.

68.What do we learn from the Peru example?

A.White paint is usually safe for buildings.

B.The global warming trend cannot be stopped.

C.This country is heating up too quickly.

D.Sunlight reflection may relieve global warming.

69.According to the author, polluting industries should ________.

A.adapt to carbon pollution

B.plant highly profitable crops

C.leave carbon emission alone

D.fight against carbon pollution

70.What's the author's preferred solution to global warming?

A.Setting up a new standard.

B.Reducing carbon emission.

C.Adapting to climate change.

D.Monitoring polluting industries.

[2017·全国卷Ⅰ]

D

A build-it-yourself solar still(蒸馏器) is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the US Department of Agricultur e, it's an excellent water collector. Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes. The only components required, though, are a 5′×5′ sheet of clear or slightly milky plastic, six feet of plastic tube, and a container—perhaps just a drinking cup—to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.

To construct a working still, use a sharp stick or rock to dig a hole four feet across and three feet deep. Try to make the hole in a damp area to increase the water catcher's productivity. Place your cup in the deepest part of the hole. Then lay the tube in place so that one end rests all the way in the cup and the rest of the line runs up—and out—the side of the hole.

Next, cover the hole with the plastic sheet, securing the edges of the plastic with dirt and weighting the sheet's centre down with a rock. The plastic should now form a cone(圆锥体) with 45-degree-angled sides. The low point of the sheet must be centered directly over, and no more than three inches above, the cup.

The solar still works by creating a greenhouse under the plastic. Ground water evaporates (蒸发) and collects on the sheet until small drops of water form, run down the material, and fall off into the cup. When the container is full, you can suck the refreshment out through the tube, and won't have to break down the still every time you need a drink.

32.What do we know about the solar still equipment from the first paragraph?

A.It's delicate. B.It's expensive.

C.It's complex. D.It's portable.

33.What does the underlined phrase ―the water catcher‖ in Paragraph 2 refer to?

A.The tube. B.The still.

C.The hole. D.The cup.

34.What is the last step of constructing a working solar still?

A.Dig a hole of a certain size.

B.Put the cup in place.[

C.Weight the sheet's centre down.

D.Cover the hole with the plastic sheet.

35.When a solar still works, drops of water come into the cup from ________.

A.the plastic tube B.outside the hole

C.the open air D.beneath the sheet

[2017·全国卷Ⅱ]

C

Terrafugia Inc.said Monday that its new flying car has completed its first flight,bringing the company closer to its goal of selling the flying car within the next year. The vehicle—named the Transition—has two seats, four wheels and wings that fold up so it can be driven like a car. The Transition,which flew at 1,400 feet for eight minutes last month, can reach around 70 miles per hour on the road and 115 in the air. It flies using a 23-gallon tank of gas and burns 5 gallons per hour in the air. On the ground, it gets 35 miles per gallon.

Around 100 people have already put down a $10,000 deposit to get a Transition when they go on sale, and those numbers will likely rise after Terrafugia introduces the Transition to the public later this week at the New York Auto Show. But don't expect it to show up in too many driveways. It's expected to cost $279,000.And it won't help if you're stuck in traffic. The car needs a runway.

Inventors have been trying to make flying cars since the 1930s, according to Robert Mann, an airline industry expert. But Mann thinks Terrafugia has come closer than anyone to making the flying car a reality. The government has already permitted the company to use special materials to make it easier for the vehicle to fly. The Transition is now going through crash tests to make sure it meets federal safety standards.

Mann said Terrafugia was helped by the Federal Aviation Administrati on's decision five years ago to create a separate set of standards for light sport aircraft, which are lower than those for pilots of larger planes. Terrafugia says an owner would need to pass a test and complete 20 hours of flying time to be able to fly the Transition,a requirement pilots would find relatively easy to meet.

科普说明文

科普说明文 导读:科普说明文有两种:一种是科学小品,另一种是一般科学说明文。科学小品属于文艺性说明文,在说明中兼用文艺性笔调讲述科学道理,介绍科学知识,是用小品文的形式来表现科学内容的文章。一般科学说明文是单纯客观地介绍科学知识的文章,不大讲文艺性笔调。 范文一:达尔文之岛 达尔文岛是一座杳无人烟,且天然环境优美的岛屿。一位美国人在某一天踏上了这片未开发的土地,开始进研究,他就是闻名遐迩的生物学家—达尔文。 达尔文乘着“小猎犬号”来到这座岛屿,就被这里深深吸引住。研究了许多年,达尔文带着许多重要的数据和观察结果,发表了一篇影响世界的论文“进化论”,提出有名的理论为“适者生存,不适者淘汰”的想法。 在几十年后的今天,又有一批科学家前往这座因达尔文而闻名的达尔文之岛。他们拥有着高科技的潜水设备,可以捕捉许多人类前所未见的海洋生物,几乎每天都有一种海洋生物在进化,让科学家兴奋不已!但是现在却因为参观的人太多,造成环境破坏,许多珍贵的生物资源因此消失殆尽。 其实中国也是一座美丽的岛屿,在人类尚未积极开发前都非常完美,直到我们人类来了,有些动物遭滥捕滥杀,而造成许多生物因此

绝迹。希望达尔文之岛的危机,能够警惕我们身为中国的一份子,多想想我们的美丽岛屿吧! 范文二:八大行星 北回归线太阳馆的陈老师与蔡老师带来天文魔法宅急便,为我们上了四堂八大行星的课程,打开天文的.知识之窗,带领我们进入奥妙的天文瀚海中。 水星在古代称做辰星,绕太阳一圈只要八十八天,没有自然卫星,也是八大行星中最小的一颗。它离太阳最近,温差最大,最高温有六百度,最低温是零下一百七十三度,因为没有大气层的保护,所以容易受到陨石撞击。 金星在古代称为太白,是八大行星中自转最慢的行星,而且太阳是从它的西边升上来,东边落下去,跟地球相反。第三颗行星是地球,唯一目前有生命的星球。火星古代称为荧惑,上面有大峡谷及太阳系中最高的山----奥林帕斯山,它有二万多公尺,是圣母峰的三倍高,它的卫星像马铃薯,真有趣呢! 木星像穿着木条纹衣,古时候称为岁星,有六十四颗卫星和一个大红斑。土星被称为镇星,泰坦卫星是六十颗的卫星中最大的一颗,目前在北回归线太阳馆中有一架泰坦火箭喔! 木星、土星、天王星、海王星都是由气体组成,土星有一个游泳圈,天王星是躺着转动,而海王星竟然是由数学家计算出来的,并非实际观测发现的,和木星不一样,它拥有一个大黑斑。

浅谈初中语文说明文教学

浅谈初中语文说明文教学 发表时间:2012-03-29T08:44:42.827Z 来源:《新疆教育》2012年第1期供稿作者:邓玉格[导读] 一谈到说明文阅读教学,大多数老师都有这样的烦恼:教好教,考难考。 河北省平乡县第三中学邓玉格 一谈到说明文阅读教学,大多数老师都有这样的烦恼:教好教,考难考。事实也是,我们初中的说明文课文大多浅显易懂,在教学时只要扣住说明文的几个要素就行了,但是学生在考试时却失分很多,甚至有些题目错得很离谱。针对这种情况,我认为我们很有必要研究一下说明文的阅读教学,从整体出发,总体确定教学目标及要求,设计教案组织教学。 1 初中语文说明文教学的基本思路 1.1 学会概括主要内容。淤摘录法:有的文章题目本身点出了说明内容,有中心句的文章或段落可采用直接摘录的方法;有的文章中心句过长,可以采用压缩摘录法。于概括法:先将文章的各个部分或各个层次的内容进行概括,再将它们合并起来。盂摘要法:有些说明文全篇几个部分的内容有主次之分,如,要求回答“本文主要说明的内容是什么”的时候,我们需要选取主要的、舍弃次要的。榆列图表:这类题的特点是,给我们一部分内容,要求根据所给的内容填写另一部分内容。对于这样的题,要根据所给的提示语,采取“概括法”概括文章说明的内容。 1.2 学习说明方法的运用及作用。说明方法是为了把事物或者事理的特征介绍得清楚、明白所采取的方式、方法。常见的说明方法有九种:下定义、作诠释、分类别、作比较、举例子、列数字、打比方、摹状貌、列图表。认真地辨析说明方法会加深对文章的理解。一般的说明方法都容易从语言的特点上体现出来,比较难一点的是下定义和作诠释的区别。下定义要求完善,即定义的对象和所下的定义的外延要相等,并且要求从一个方面完整地揭示概念的内涵,而作诠释不要求这么完整,只要能够揭示概念的部分内涵即可,诠释的对象与作的诠释的外延可以不相等,而定义的主语和宾语必须是相等的,它们可以颠倒。用这个方法就可以区别二者了。 1.3 判断说明顺序。说明顺序大体有三种:时间顺序、空间顺序、逻辑顺序。解说事物的发展、变化及制造过程,文章中有表示时间变化或程序性词语,是时间顺序。解说实体事物(特别是建筑物),文章中有方位性词语(上、下、左、右、东、西、南、北等),是空间顺序。辨别逻辑顺序的难度比较大,因为它在说明文中体现在事物的内部联系、或者说人们对事物的认识过程的顺序,这种顺序有多种关系的形式:“概括———具体”、“整体———局部”、“原因———结果”、“特点———用途”、“主要———次要”、“现象———本质”、“一般———特殊”等,我们可以借助这些形式进行判断。 1.4 掌握说明语言的特点。语言的准确性,是说明文语言的最基本的特点,是说明文这种文体具有较强的科学性这一特点决定的。在说明文阅读题中,常以某个起限制修饰作用的字、词、句的选择、替换、增删来引导学生品味说明文语言准确性的特点。我们要特别要注意的是文中的修饰、限制性词语。比如:表范围的:“都、总、共、总共、统统、一律、一概;大部分、部分、有些;只、仅仅”等;表程度的:“非常、十分、最、很、极;几乎、稍微、比较(早)”等;表揣测、估计的:“大概、大约、左右、可能”等;表限制的:“当时、主要”等。 2 初中语文说明文教学策略 2.1 情境激发。“探究———体验”式学习的主体是学生,但主导设计仍是教师。为学生创设有意义的学习情境,有助于激发学生学习的兴趣,调动学生积极的情感体验。这是“探究———体验”式学习的开端,也是引发学生积极主动参与学习的动力。 2.2 整体感知。个别有感情地朗读课文,划出生字新词。思考:本文所写的亲情是指什么情?本文所写的亲情体现在温情与和美中,还是误解和冲突中? 2.3 创设情景。在教学中创设这样的情境,学生会情不自禁地用眼睛去看,用耳朵去听,用脑子去想,这样,使整个情境成为一个多向折射的心理场,学生置身于这种特定的心理场中,对文本和情境的体验、领悟,必然更加深入。这种整体和谐的情境体验,能使学生的知识、能力、心理品质得到协同发展,从而保证语文教学任务的全面完成。 3 以《苏州园林》为例,浅析初中语文说明文教学的具体操作步骤 3.1 宏观把握:引导学生从课题入手,抓住文眼;阅读预习提示,理清文章思路和线索,从整体上感知课文;弄清学习的重点,明确课文学习目标,以便有针对性地学习,然后根据预习提示初读课文,逐步培养学生在阅读中捕捉最主要信息的能力,培养概括能力。 3.2 熟读讨论:按阅读说明文要注意的五个方面,逐一对照加强领会,以达到对文章的整体感悟,把握文章的主要内容。这一过程是教会学生精读,抓住课文中的重点语段作深层次的理解,在理解的过程中学习对文章作圈点批注,这一步是引导学生学习的关键,既要教会学生学会全面阅读,又要让学生学会重点阅读;既有面,又有点,既有整体的理解,又有重点语段的深入研究,既避免逐段肢解文章而浪费时间,又培养了学生良好的读书习惯。 3.3 指导小结:引导学生对课文进行小结,这一步是对前面读书活动的升华。培养了学生整理、归纳、概括的能力,进而能总结出说明文阅读的一般规律。这样的剖析,总结了阅读说明文的基本规律,再通过其它课文的举一反三,涉及不同类型课文的不同特点,加以比较,学生会触类旁通,也就对说明文的阅读有了一定的了解。

阅读理解之科普类说明文答案解析

1. 【解析】 试题分析:这是一篇说明文。本文通过举例说明了太空生活的奇妙:在太空睡觉时,对宇航员来说主要的挑战在于恰当的睡眠姿势;宇航员在一个地方运动久了会出现碳毒性头痛;宇航员的大脑接收到矛盾的信息时会感到恶心。最后告诉我们美国国家宇航局对宇航员主要的担心是宇航员回家后的修养期和如何在太空长久地保持健康。 63.A细节理解题。根据第二段第一、二句“First consider something as simple as sleep. Its position presents its own chal lenges.”可知在太空睡觉时,对宇航员来说主要的挑战在于恰当的睡眠姿势。故选A项。 64. C细节理解题。根据第三段中“But station residents have to be careful about staying in one place too long. …You can end up with what astronauts call a carbon-dioxide headache”可知宇航员在一个地方运动久了会出现碳毒性头痛。故选C项。 65. D细节理解题。根据第四段中“Your inner ear thinks you’re failing. Meanwhile your eyes are telling you you’re standing straight. That can be annoying-that’s why some people feel sick.”可知宇航员在大脑接收到矛盾的信息时会感到恶心。故选D项。 66.B细节理解题。根据最后一段倒数第一、二句“The focus on fitness is as much about science and the future as is about keeping any individual astronaut healthy…NASA is worried about two things :… and, more importantly, how maintain strength and fitness…”可知美国国家宇航局对宇航员主要的担心之一是如何在太空长久地保持健康。故选B项。 【考点定位】说明文阅读 【名师点睛】科普类说明文历来是高考阅读理解命题的重点,文章逻辑性强,条理清楚,主要考查学生对语篇的整体把握和领悟能力以及对特定细节的认读和处理能力。考生应注意:1.平时多读科普知识类文章,学习科普知识,积累常见的科普词汇,从根本上提高科普英语的阅读能力。2.熟悉科普类文章的结构特点。科普类文章一般由标题(高考题中一般不给出标题)、导语、背景、主体和结尾五部分构成。导语一般位于整篇文章的首段。背景交待一个事实的起因。主体则对导语概括的事实进行详细叙述,这部分是命题的重点,考生应该重点把握。结尾往往也是中心思想的概括,并与导语相呼应,命题者常在此要设计一道推理判断题。3. 在进行推理判断时,考生一定要以阅读材料所提供的科学事实为依据,同时所得出的结论还应符合基本的科普常识。 2. 【解析】 试题分析:文章解释了生活在海洋的透明生物的特点,透明原理,以及形成机制。 63.B 细节理解题。文章第一段第三行:Mostof them are extremely delicate and can be damaged by a simple touch。得知B选项:透明动物是很容易受伤的。故选B。 64.D 词义猜测题。该词出现在文章第三段第三行。前文提到了:你能看到的物体一种是对光线进行了散射;而另外一种是对光线的吸收。既然吸收了,那在光的传播过程中就完全阻止了,因此这里dead是完全的意思。故选D。 65.C 推理判断题。根据第五段第一句To become transparent, an animal needs to keep its body from absorbing or scattering light。可知,想变透明就要避免散射或吸收光线,因此其中的一个方法是C选项,避免光线的吸收。故选C。 66.D 推理判断题。根据最后一段第一句中的make all the different tissues in their bodies slow down light exactly as much as water does可以推断出D为正确答案。其中slowdown对应reduce。故选D。 【考点定位】科技类说明文 【名师点睛】做科技类说明文时,考生应能:理解语篇主旨要义,理解文中具体信息,根据上下文提供的线索推测生词的词义,根据文中事实和线索作出简单的判断和推理。此次出现了新型科技类说明文。往年科技类说明文的阅读难点在于专业类词汇,但是今年的“新型耳机”在问题设置上难度不大,属于文章难但题目不难的题目。所以要理解好文章做好此题就不是难题。

(2015_2018)高考英语试题分项版解析专题16科普类说明文(含解析)

专题16 科普类说明文 2018高考题 D【2018·全国I】 We may think we're a culture that gets rid of our worn technology at the first sight of something shiny and new, but a new study shows that we keep using our old devices(装置) well after they go out of style. That’s bad news for the environment — and our wallets — as these outdated devices consume much more energy than the newer ones that do the same things. To figure out how much power these devices are using, Callie Babbitt and her colleagues at the Rochester Institute of Technology in New York tracked the environmental costs for each product throughout its life — from when its minerals are mined to when we stop using the device. This method provided a readout for how home energy use has evolved since the early 1990s. Devices were grouped by generation — Desktop computers, basic mobile phones, and box-set TVs defined 1992. Digital cameras arrived on the scene in 1997. And MP3 players, smart phones, and LCD TVs entered homes in 2002, before tablets and e-readers showed up in 2007. As we accumulated more devices, however, we didn't throw out our old ones. "The living-room television is replaced and gets planted in the kids' room, and suddenly one day, you have a TV in every room of the house," said one researcher. The average number of electronic devices rose from four per household in 1992 to 13 in 2007. We're not just keeping these old devices — we continue to use them. According to the analysis of Babbitt's team, old desktop monitors and box TVs with cathode ray tubes are the worst devices with their energy consumption and contribution to greenhouse gas emissions(排放)more than doubling during the 1992 to 2007 window. So what's the solution(解决方案)? The team's data only went up to 2007, but the researchers also explored what would happen if consumers replaced old products with new electronics that serve more than one function, such as a tablet for word processing and TV viewing. They found that more on-demand entertainment viewing on tablets instead of TVs and desktop computers could cut energy consumption by 44%. 32. What does the author think of new devices? A. They are environment-friendly. B. They are no better than the old. C. They cost more to use at home. D. They go out of style quickly.

初中语文教学课例研究报告

初中语文教学课例研究 报告 Document serial number【NL89WT-NY98YT-NC8CB-NNUUT-

初中语文教学课例研究报告 提高说明文教学效率 一问题提出的背景 说明文是八年级上册的重要内容,本册的教学重点是培养说明能力。到这册书,教材采用了文体线索和学生心理特点线索双线并进的编排思路,开始强调文体的概念和文体知识的系统性。教学中,我们往往是采用逐项讲解,逐项学习的方法进行学习的,但我觉得这样教学效率低下,往往是就文学文,而忽视了文体教学的系统性。 说明文是一种旨在传播知识的文体,主要的目的是让学生“懂”,知识性很鲜明,能力要求明确。因此如果在教学中梳理知识点,提出明确的能力训练点,那么说明文教学的效果可能会有较大的提高。 (二)课程标准 课标要求“阅读科技作品,注意领会作品中所体现的科学精神和科学思想方法。”要达到这样的目的,就得了解相应的文体知识和文体表达特点,对于说明文,就是如说明的方法,说明的顺序,说明的结构等。 (三)本校实际 我校是一所农村中学,办学条件相对薄弱,生源素质较低,学生的文化熏陶、家庭教育都与城市有较大的差异,有的学生带着混日子的心态踏人校门,基础差,成绩不理想,他们往往就是老师讲的就学学,不能自己总结、归纳所学的内容。是推推动动,不推不动的状态。这就要求教师在教学中加强系统性,重在指导,促动学生学习,激发他们学习的主动性,自觉性,提高学习的效率。 所以,我们确立了“提高说明文教学效率”的研究主题。 二研究过程描述 (一)确定说明文教学内容的明确内容 教学要在教学内容的研究上下功夫。说明文的学习在教材中编排了两个单元,基本是按说明内容来编排的,一个是事物说明文单元,一个是事理说明文单元,在这两个单元的学习中,既要学习课文的相应内容,也要学习说明文的

科普说明文三篇

科普说明文三篇 科普说明文一 我生活在一个大家庭里。在那儿,每个家庭成员的形态都各不相同:胖的、瘦的、高的、矮的、方的、圆的。我们各尽其职,在人类的日常生活中起着举足轻重的作用。说这话可一点儿也不假。试问,从录音机、照相机到寻呼机、手机,哪个少得了我们“电池家族”啊?据调查统计,我国是干电池生产、消费大国,一年产量达150亿只,居世界第一位;消费量约为70亿只,平均每个中国公民一年要消费掉5只干电池呢!由此可见,电池的使用范围很广,用量也很大。这也更加巩固了我们在生活中的重要地位,成了名副其实的使用广泛的商品之一。 我是由锌皮(铁皮)、碳棒、汞、硫酸化合物组成的,我的兄弟蓄电池则以铅的化合物为主。随着我们“电池家族”队伍的不断壮大,废旧电池也悄然滋生。由于废旧电池所造成的污染不像大气、垃圾和水污染那样明显,而是充当一个“隐性杀手”的角色,所以一直得不到人们的重视,但这些废旧电池虽小,威慑力却不容忽视。它会严重破坏生态环境,这是由我们自身的组成成份决定的。这些物质在使用过程中,被封存着电池壳内部,并不会对环境造成影响。但经过长时间

的机械磨损和腐蚀,使得内部的重金属和酸碱等泄露出来,进入土壤或水源,造成环境污染,而且对人体健康也造成一定伤害。据资料显示,废旧电池对土壤污染很严重,可以造成农作物绝收。一粒钮扣电池能污染60万升水,相当于一个人一生饮水量;一节1号电池埋在土壤里,能使1平方米的土地失去使用价值。这样一来,我们“电池家族”岂不蒙受了“不白之冤”,承担了污染环境的罪名?在这里我要为电池同胞们说句话:我们电池一生的使命就是为人们奉献,等到失去了使用价值,只剩一幅“浑身是病”的躯壳,难道也是我们的罪过吗?不!是因为人类缺乏环保意识,才使我们成为元凶。 目前,人们的环保意识还很淡薄,也根本没有意识到废旧电池的危害性。有不少人把它与生活垃圾一同倒掉,形成了巨大的污染源。世界上生活垃圾的处理方式主要是卫生填埋、焚烧和堆肥,混入其中的废旧电池也在这三个过程中发生了污染作用。当采用填埋的方式时,废旧电池的重金属通过渗滤作用污染水源和土壤;当采用焚烧的方式时,废旧电池在高温下,腐蚀设备,某些重金属在焚烧炉中挥发在飞灰中,造成了大气污染。焚烧炉底重金属堆积,给产生的灰渣造成污染;当采用堆肥的方式时,废旧电池的重金属含量较高,造成堆肥的质量下降。除此以外,人们也会采用再利用的方式。这样的话,工艺虽然容易掌握,但回收率只有82%,其余的铅以气体和粉尘的形态出现,同时冶炼过程中二氧化硫会进

最新2019-2020学年部编八年级语文下册说明文阅读(精编版)-精选

八年级语文下册说明文阅读 说明文是以说明为主,兼用叙述、描写、议论等表达方式,用以介绍事物、解说事理的文体。它主要是介绍客观事物的形状、构造、性质、特点、成因、关系、功用,解释事理的含义、特点、演变过程等。 因为说明文以普及科学知识为目的,所以它以客观介绍为主,一般不表示作者的主张和思想感情的倾向。同时说明文的语言必须简洁、准确、明白,让人易懂易解。 它主要包含几个要素:说明特征,说明顺序,说明方法,说明语言 一、抓住事物特征 抓住事物特点,把握说明中心,这是写说明文的一个重要要求。同一事物往往有多方面的特征。我们要尽可能全面地列出某一事物的全面特征,以便抓住某一事物区别于其他事物最本质、最主要的方面。例如《景泰蓝的制作》一文则主要抓住其手工操作和制作过程中的繁复、精细的特点进行介绍。如果面面俱到,反而会使文章详略不当,主次不分,重点不突出。 二、选择说明顺序。

要解释说明一种事物,按照一定的顺序,才会显得条理清晰,让读者一目了然。这说明顺序大致可分为:时间顺序、空间顺序、逻辑顺序等,具体讲解如下: 时间顺序 即按照时间的先后顺序来说明一件事物。如我要说明电视机的演变过程。先介绍80年代的黑白电视机,再到90年代的彩色电视机,再到现在的液晶电视机。 空间顺序 即按照事物的方向位置安排材料,或从左到右,或从外到里,或从局部到整体等来加以介绍。 采用这种顺序一般用在介绍建筑物或者一件具体的事物,或者某一个景点。如,我要介绍一个建筑物,先从整体来介绍它的情况,再进到里面具体来写每一部分。 逻辑顺序 所谓逻辑顺序,即按照事物的内在逻辑关系来组织材料。如分析说明一种事物形成的因果关系,或分析一种现象,由个别到一般,由具体到抽象,由主要到次要,由现象到本质,等介绍说明。 例如我要分析手机的功能,它的主要功能是什么?为什么要有这种功能?它是遵从什么原理?等等。

初中语文说明文教学之我见

初中语文说明文教学之我见 摘要:说明文是以说明为主要表达方式的一种文体,是初中语文教学中的一项重要体裁之一,也是初中语文教学的一个难点。提高初中语文说明文教学的效率,是当前初中语文教学的一项迫切任务。 关键词:初中语文;说明文;教学 中图分类号:G632 文献标识码:B 文章编号:1002-7661(2015)10-344-01 随着课程改革的逐步实施和进一步深入,初中语文说明文教学渐渐得到应有的重视。在现阶段的初中语文教学过程中,如何搞好说明文部分的教学,提高教学质量是广大初中语文教师不断深思的问题之一。本文笔者结合教学实践,就初中语文说明教学谈谈几点自己的教学浅见,在此和大家交流。 一、提高认识,明确教学目标 说明文作为描述、表达的一项主要文体,同人们的生产、工作和生活有着密切的关系,是文学作品所无法替代的。从说明文的内容上看,它既有丰富的知识,又通俗易懂,富有情趣,能激发人们的兴趣。不仅给人以经验和智慧,而且给人以启迪和开拓。初中语文课程标准指出:“初中阶段的语文教学,要进一步培养学生的爱国主义精神,培养社会主

义思想道德品质;努力开拓学生的视野,注重培养创新精神,提高文化品位和审美情趣,发展健康个性,逐步形成健全人格。”在初中语文教学过程中开展说明文教学,搞好说明文教学,符合新时代教学理念的要求,对健全学生人格,培养学生的较强的说明能力、先分析事物的能力,以及对于他们日后在社会生活的各个领域中的发展将会发挥重要的作用。因此,作为一名合格的初中语文教师,我们应正确认识初中语文说明文的教学意义,充分明确说明文的教学目标,如实的搞好初中语文说明文教学,提高教学效果,激发学生进一步思考和研究的兴趣,培养学生的各方面能力,充分发挥出初中说明文教学的育人作用,不断提高教学效率。 二、初中语文说明文教学的基本思路分析 很长一段时间以来,受传统教学观念的影响,我们的初中语文说明文教学一直处在“读说明文”的边缘徘徊。在传统的说明文教学过程中,很多教师在教学的时候往往都是草草了事,要么是领着学生读几遍课文,要么就是成篇成段的要求学生背诵,完全不讲究章法,忽视了教学目标、学生的主体地位,学生都是在被动的接受知识,不利于学生能力的培养以及对知识的吸收。课程改革的今天,新课改给我们指导了许多的教学思想和方法,教学中,作为教师的我们,应积极的转变教学观念,充分认识说明文教学,明确教学的基本思路,对学生进行有效的培养。在初中语文说明文教学

2019届高考英语阅读理解:科普类说明文----有解析

科教科普类 1、Australia leads the world in its number of resident poisonous spiders as well as the strength of their toxicity(毒性). However,of almost 9,800 species most are perfectly harmless and interesting. Spider diversity is broad and many fascinating species occur here that range from the large to the tiny and hardly noticed, and from the dullest black to the strangely shaped. Spiders can be roughly classified according to the strategies(策略) they use for feeding. Spiders which appeared earlier in the evolutionary scale feed by waiting in a cave for food to come along before grabbing it. Following them were spiders which actively wandered looking for food and which caught it by chasing it down. The evolution of flying insects makes spiders evolve ne w ways of catching food which couldn’t be chased and so the earliest air web weavers arose. Most spiders feed on insects and other arthropods but the Whistling Spider feeds on frogs and small birds. The Golden Orb Spider also feeds on small birds. A spider periodically sheds(蜕皮;脱落) its skin so that it can grow. Immature stages are called moults. Each species has a particular number of moults that it will go through before reaching its final adult stage. Usually, once male spiders have mated, they die shortly after. But, even in death, Redback males often serve a purpose. The already pregnant Redback females always kill their lover and, in most cases, also eat them. This provides them with a small reproductive advantage. Allowing spiders to take up places around houses can be beneficial in that they catch other annoying insects such as mosquitoes and flies. Rest assured that while you might see some large spiders, and perhaps even some poisonous ones, a good rule is to look and admire but don't touch any spider you find. Even those without poison could still have a nasty bite. 1.Different families of spiders are identified themselves by ______. A.their physical character B.their ways of getting food C.the strength of their toxicity D.their effect on the environment 2.What are the latest spiders in their evolution process?

部编版八年级上语文说明文阅读练习含答案

八年级语文说明文课外阅读训练(一) (一)有趣的彗星世界 彗星是围绕太阳运行的一种质量很小的天体,由于它的形状像扫帚,所以又叫扫帚星。彗星都有一个椭圆形的运行轨道,运行周期也长短不一。如海尔—波普彗星的运行周期为3000年,而哈雷彗星的运行周期却只有76年。彗星的尾巴叫彗尾,是它最朦胧和最具风采的部分。一般彗尾巴只有几千公里长,但最长的彗尾则可达几亿公里,可谓天地万物中独一无二的大尾巴了。它在茫茫太空,宛如一把辉煌巨帚,横扫遥遥之路。人类自发现彗星轨道以来,发现临近地球最近的一颗彗星是伊拉斯—阿拉基—阿尔科克彗星,它在1983年5月11日,距地球只有500万公里,可说与地球“擦肩而过”了。由于人类长期的天象观测,至今已发现1600多颗彗星绕太阳运行。纷繁有趣的彗星世界,使人们遐想万千。彗星究竟诞生何处,一直是天文学家们探索的课题。近年,美国“哈勃”天文望远镜发现太阳系边缘有一个庞大的彗星“摇篮”。“摇篮”呈环状,内环位于天王星轨道之外,外环则超出了冥王星轨道。这个“摇篮”中约有2亿个彗星“婴儿”,它们主要由直径10—500公里的冰块和石块组成。由于太阳系中各大星球错综复杂的引力作用,“婴儿”一旦被什么外来碎块撞击,便偏离自己原来的轨道而成为“游子”。“游子”因太阳强大的引力,朝着太阳方向飞去。途中,冰块等物质受太阳光热而蒸发,并在太阳风的作用下飘成扫帚状,成为它美丽的大尾巴。 人类通过对彗星的遥测,发现彗星能释放X射线。美国堪萨斯大学的有关研究小组揭示,太阳风的离子和彗星的相互作用是彗星释放X射线的起因。科学家们还就彗星上存在大量冰块而提出假设,认为地球上的水来自远古时期撞击地球的彗星,并以此解释海洋形成之谜。然而这种假设能否成立,关键就看彗星上的微量元素与海洋中的微量元素是否一致。据报道,美国正准备用探空火箭去索取彗星资料,对此,人们只有拭目以待,并期盼佳音。 1. 文中第一段说明了哪几个方面的内容? 2. 第二段文字说明的主要内容是: 3. 第二段中用了一个系列性的比喻来说明彗星的形成过程,它们是: 4. 第三段文字中“假设”的内容,与第二段中哪一句话相照应? 5. 第三段文字中“拭目以待,并期盼佳音”指的是什么? 6. 用下定义的方法说说什么是“彗星”。

初中语文说明文教学

初中语文说明文教学 摘要:长期以来,说明文教学不受重视,甚至被忽略,这是因为说明文一般平平实实,缺乏形象性。老师上课时,再那么一肢解,抽血去肉,剩下“说明对象、说明顺序、说明方法”几块骨头让学生啃,结果学生只能由被动应付变为厌学说明文。另外,中学写作教学对说明文的练习也不够重视,以致不少写作能手虽能写出好的记叙文和议论文,却写不出像样的说明文。就目前三种基本文体教学来看,说明文教学是最为薄弱的环节。那么应该怎样改变这种现状呢于是,笔者在说明文教学中,运用下面几种教法,来调动学生学习说明文的积极性。 关键词:初中语文说明文教学 一、注意课堂教学的生发,要开拓与课文有联系的知识 因为中学生好奇心强,对新鲜事物比较敏感,只要是新奇的东西,就容易引起他们的关注。学生对学习说明文最厌烦的是老调重弹,所谓“说明对象、说明方法、说明顺序”这些套话,他们一点就熟了,何需我们老师喋喋不休!于是笔者就采用了生发和拓宽的方法,激发学生的兴趣。例如在写作文时,笔者让学生写一篇与仿生学有关的科幻式小品文。学生的习作内容丰富多彩,趣味百出,有写绿色与伪装

学的,有写跳蚤与生物战的,其中有个学生参考了课文《蝉》中蝉的习性,写了题为《蝉与音响学》,设想了要发明一种像蝉一样大小却能发出无限大声音的袖珍放音机。内容虽近乎荒诞,但却妙趣横生。这样的教学方法不仅大大地激发了学生读写说明文的兴趣,而且丰富了学生的课外知识,并取得明显的教学效果。 二、运用激发情趣的方法导入课文 倘若每节说明文教学一开始就能使学生很轻松地进入 学习境界,学生就不会觉得学说明文是一种负担,教学效果则会好些。不久前笔者上法布尔的《蝉》,课上介绍了蝉的知识,说蝉的俗名叫“知了”古人叫“蜩螗”,它是诗中常见的寓体,还是治病的良药;再由科学家研究蝉的目的,讲到人类与昆虫的关系,介绍了仿生学、鸟儿与飞机、鲸与轮船、蜜蜂与建筑、车轮子与螺旋状……还介绍了作者之所以被誉为“昆虫世界的荷马”,这与他长期对各种昆虫的观察研究是分不开的。同时,笔者还介绍了观察的要求和作法,又举了习作中不善观察不作思考而闹出的种种笑话。这既有知识性又有趣味性的内容,大大激发了学生学习的兴趣。笔者在教《蜘蛛》一课时,让学生猜谜:“南阳诸葛亮,稳坐中军帐。摆起八卦阵,单提飞来将。”谜面有趣简单,学生很快就猜着了。接着再提两个问题,蜘蛛以什么为生它是怎样吐丝的因为蜘蛛是学生所熟悉的动物,所以他们的积极性

2020年中考语文专题复习:科普说明文阅读教案

科普说明文阅读教案 一、教学目标及重难点: 1、通过学习科普文章,了解简单的物候知识。 2、初步了解一些说明文的知识,掌握有条理地说明事物和举例说明的方法。(重难点) 二、知识梳理: 一、科普说明文的特征 说明文一般分为说明事理和说明事物两大类。无论是说明事理还是说明事物,只要是以介绍科学知识为主,就可以称为科学说明文。这类科普说明文形式简短、知识性、科学性、普及性强;通常以读者的认识、思维逻辑顺序来安排层次,运用平实的表现手法,语言的运用强调科学、准确、鲜明。科普说明文一般是以通俗的形式介绍某种事物或现象,说明它的形态、特征、性质、意义、成因及其功能和作用等。 主要应注意以下几点: 1.科普文的特点: 科普文和其他文章不同,它以普及科学技术知识为目的,所以具有如下特点: a知识性、科学性,科普文说明的内容具有科学性,文中所写的人、事、物都是客观存在的事实,不能凭空想象、虚构;引用概念、数据、事实和使用语言都要准确无误,即使是拟人化的语言,也要注意准确。 b形象性、趣味性,科普文常常综合运用各种手法,如比喻、拟人、悬念、联想等,语言也比较通俗生动,目的是把枯燥的科学道理讲得津津有味,让人易于理解、接受、产生兴趣。 c思想性、时代性,作者往往紧追时代信息,站在科学技术和科学思想的最前沿,不仅把最新的科学知识传播给我们,而且寓思想与知识之中,重在以科学精神、科学思想和科学方法教育人、感染人。 2.文章的基本内容:把握科普文的特点,阅读时要一边读一边想,看看文章给我们讲了哪些科学知识,同时,还要弄清文章的条理,看看文章先写什么,后写什么,是按怎样的顺序写的,结构是否严谨,逻辑是否严密。弄清楚文章叙述的事物的概念、特点、构造、作用等等,才能

统编人教部编版小学语文三年级下册语文说明文阅读训练(含答案)

三年级下语文说明文阅读训练 一、阅读短文,回答问题。 在沙漠地区,植物很稀少,它们为了适应干旱的气候,便长成了与众不同的奇怪相貌。 号称“无叶树”的梭梭,为了减少水分的蒸发,叶子已经退化得像鳞片一样裹在树枝上,主要靠绿色的树枝代替叶子进行光合作用,制造养料。 仙人掌把叶子变成了刺,怪柳干脆没有叶子。 在风沙侵袭、沙丘流动的地区,还常常可以看到沙丘上生长着花儿鲜红的红柳树,为沙漠增添了生气。风卷流沙压埋它一次,它就又迅速地生长一层,始终傲立在沙丘之上,把沙丘踩在脚下。 沙漠里还有一种高大的胡杨树,它不怕沙漠里的盐碱,因为它本身是一座小型的化工厂,把对植物有害的盐碱,变成可以蒸馒头、做糕点和洗衣服的“胡杨碱”。只要在树干上划上一刀,它就会淌下像眼泪一样的胡汤碱来。 不过,沙漠中的植物尽管样子不同,性格各异,但也有其共性。比如,为了吸取沙土深层的水分以维持生命,沙漠植物都有特别发达的根系。有些沙漠植物的主根可以达到20多米深。再如,沙漠植物大都长成“根深但叶不茂”的怪样子——这是它们适应沙漠气候环境的结果。 1.号称“无叶树”的梭梭,叶子退化得像鳞片一样的原因是什么?()A.它原本就没有叶子。 B.它的叶子裹在树枝上。 C.它为了适应干旱的气候,减少水分的蒸发。 D.它要进行光合作用,制造养料。 2.短文第5自然段把胡杨树说成是“一座小型的化工厂”,是因为什么?()A.它长得非常高大。 B.它不怕沙漠里的盐碱。 C.它的树干上会淌下像眼泪一样的胡杨碱。 D.它能把对植物有害的盐碱,变成可以蒸馒头、做糕点和洗衣服的“胡杨碱”。 3.沙漠中的植物都有特别发达的根系,这是因为什么?() A.沙漠土质比较松软,植物容易长根。

科普说明文介绍

科普说明文有两种:一种是科学小品,另一种是一般科学说明文.科学小品属于文艺性说明文,在说明中兼用文艺性笔调讲述科学道理,介绍科学知识,是用小品文的形式来表现科学内容的文章.一般科学说明文是单纯客观地介绍科学知识的文章,不大讲文艺性笔调. 二、科学小品的特点和写作 1.科学小品的特点 科学小品既有别于一般小品文,又和其它科普说明文不同,具有自己的特点. ⑴亦小亦新 科学小品不仅篇幅短小,还要内容新鲜独特.能尺幅千里,寸镜万菌.它紧跟科技的发展和时事的变化,及时普及新的知识. ⑵亦俗亦雅 科学小品用语通俗,浅显易懂,既能引发众人的兴趣,又能准确地说明科学知识. ⑶亦诗亦哲亦知 科学小品融科学性、艺术性和思想性于一体.因此凭添的诗、哲、知合一的风味,使人在增长知识的同时,也启发了思想,陶冶了情操. 2.科学小品的写作要求 ⑴必须准确地说明科学知识或科学道理. ⑵要活用各种说明方法,如比喻法、拟人法等,增强说明的形象感和趣味性. ⑶要从科学中发掘美,开人心智,陶冶性情. 三、一般科学说明文的特点和写作要求 1.一般科学说明文的特点 ⑴说明性 科普说明文的写作目的在于介绍科学知识.是科普说明文,就要介绍科学知识. ⑵单一性 一篇科普说明文,一般只说明一个科学现象,介绍一种科学知识. ⑶通俗性 科普说明文介绍的知识多是普及性的,所以要求用通俗有趣的浯言,深入浅出地进行说明. 2.一般科学说明文的写作要求 (1)要有明确的目的,如此才能抓住重点,突出中心. (2)与科学小品不同,这类科普说明文一般不需要有形象,有感情,只需直接介绍事物的特征,说明某一科学现象即可. (3)因为科普说明文的根本任务在于普及科学知识,所以在表达上应力求用浅显朴实的浯言说明复杂抽象的内容

部编人教版中考语文说明文阅读专题训练及答案

部编人教版中考语文说明文阅读专题训练及答案 一、中考语文说明文阅读专题训练 1.阅读下文,回答后面小题。 鲨鱼是海洋系统的“整容师” ①鲨鱼是海洋中的庞然大物,也是食肉类的凶猛鱼类,号称“海中狼”。可是,最近它被贴上了“整容师”的标签,因为它可以改变海洋中很多鱼的眼睛和尾鳍的尺寸。听到这些,你是否感到十分惊讶呢? ②原来,在海洋系统中,许多小鱼都有着较大的眼睛和有力的尾鳍,帮助它们及时发现并快速躲避鲨鱼的攻击与吞食。尤其在鲨鱼出没捕食的低光环境下更是如此:一定尺寸的尾鳍可以保证鱼类突然加速游动,以此来远离鲨鱼的追捕。但是,在2018年1月,西澳大利亚大学等机构研究人员的最新研究发现,近年来由于人类对鲨鱼的大量猎杀,导致多种鲨鱼濒临灭绝。鲨鱼数量的减少,使得其他鱼类的生存得到了暂时的和平安稳,导致它们的形态也正在发生明显的改变,如眼睛变小,尾鳍变小。因此,鲨鱼就成了海洋系统里的“整容师”。 ③研究人员对澳大利亚西北海域罗利沙洲和斯科特礁两个珊瑚礁系统中7种不同的鱼类专门进行了对比分析。这两个珊瑚礁有着相似的自然环境,但不同的是,罗利沙洲禁止捕鱼,鲨鱼数量比较稳定,而斯科特礁允许对鲨鱼进行商业捕捞,且已经持续了一百多年。研究人员分别在两个珊瑚礁海域进行了采样捕捞,并测量出了所捕捞鱼的体长、体宽、眼部和尾鳍大小。结果发现,与罗利沙洲的鱼类相比,斯科特礁同种鱼类的眼睛尺寸小46%,尾鳍尺寸小40%。 ④研究人员解释说,人类捕捞鯊鱼使其数量减少,会造成一系列生态后果,小鱼的眼睛及尾鳍尺寸等发生变化仅仅是一个方面,其实,鲨鱼数量的减少还在悄悄地影响着其他海洋生态系统。 ⑤首先,鲨鱼数量的大幅度减少,那些体弱多病,基因突变导致畸形的鱼,就不会及时被消灭,进化过程中的优胜劣汰也不能更好地延续下去。那些没有被吃掉的弱鱼,病鱼就会一直繁殖下去,直到基因退化,这不利于种群的健康发展,对整个海洋生物多样性,优化性将是一个致命打击。 ⑥其次,鲨鱼数量的大幅度减少,将使海洋生态环境无法正常维持,水质环境会进一步恶化。因为,鲨鱼是海洋系统名副其实的“清道夫”。它可以通过清理腐烂的大型海洋动物尸体,来净化海洋生态环境。 ⑦由此看来,鲨鱼在保持海洋生态系统平衡中扮演了至关重要的角色,称它为海洋系统的“整容师”一点儿也不为过。 (选自《知识窗》,2018年第4期,有删改)(1)为什么说鲨鱼是海洋系统的“整容师”?阅读全文,概括回答。 (2)指出下面句子所使用的说明方法。 ①可是,最近它被贴上了“整容师”的标签,因为它可以改变海洋中很多鱼的眼睛和尾鰭的尺寸。________ ②结果发现,与罗利沙洲的鱼类相比,斯科特礁同种鱼类的眼睛尺寸小46%,尾鲭尺寸小40%。________

相关文档
相关文档 最新文档