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【英语】七年级英语上册阅读理解易错题集锦-名师教育1

【英语】七年级英语上册阅读理解易错题集锦-名师教育1
【英语】七年级英语上册阅读理解易错题集锦-名师教育1

【英语】七年级英语上册阅读理解易错题集锦-名师教育1

一、七年级英语上册阅读理解专项目练习(含答案解析)

1.阅读理解

It's the Chinese New Year today. Sam gets a red packet from his grandma. That's his favourite part of the festival. He gets four dollars and goes shopping in Chinatown.

There are a lot of interesting things on the streets — fireworks, lion dances and delicious foods. Then Sam sees an old man. The man sleeps in the street. He doesn't wear shoes. "He doesn't have a home. What a poor man!" Sam thinks.

At a toy shop, Sam wants to buy a toy Monkey King. But it's six dollars. Sam wants to go back home and get more money. On the way, he sees the old man again. "Why not give the four dollars to him? He can use the lucky money to buy some hot food and drinks," Sam thinks.

He gives the money to the old man and goes back home. His grandma knows his story and gives him a big hug (拥抱). What a good boy!

(1)What is Sam's favourite part about the Chinese New Year?

A. Wearing new clothes.

B. Getting red packets.

C. Visiting his grandma.

D. Going shopping.

(2)文中加下划线的单词poor的中文意思是“______”。

A. 有趣的

B. 无礼的

C. 可爱的

D. 可怜的(3)Sam doesn't buy the Monkey King because _____.

A. he dislikes it

B. he has one at home

C. it doesn't look beautiful

D. he has only four dollars

(4)What does Sam do on his way back home?

A. He can't find his money.

B. He gives his money to the old man.

C. He buys some food and drinks.

D. He says hello to the old man.

(5)Why does Sam's grandma give Sam a hug?

A. Because she thinks Sam is a good boy.

B. Because she thinks Sam is cold.

C. Because she thinks Sam is young.

D. Because it's a tradition (传统) of the Spring Festival

【答案】(1)B

(2)D

(3)D

(4)B

(5)A

【解析】【分析】主要讲了在中国新年这天Sam从奶奶那得到一个红包,去唐人街去购物时看见一个老人,把仅有的4美元给了老人,奶奶夸奖Sam是一个好孩子。

(1)细节题。根据Sam gets a red packet from his grandma. That's his favourite part of the festival.可知得到红包是Sam最喜爱的部分,故选B。

(2)细节题。根据前句He doesn't have a home.可知老人没有家,所以老人是可怜的,故选D。

(3)细节题。根据At a toy shop, Sam wants to buy a toy Monkey King. But it's six dollars.可知孙悟空6美元,而Sam仅有4美元,故选D。

(4)细节题。根据He gives the money to the old man and goes back home.可知Sam把钱给了老人,故选B。

(5)细节题,根据His grandma knows his story and gives him a big hug (拥抱). What a good boy!可知奶奶知道了Sam的故事,给了Sam一个拥抱,夸Sam是个好孩子,故选A。

【点评】考查阅读理解,主要考查细节题,注意从文中仔细寻找答案。

2.根据短文内容选择答案。

(D)

David Beckham, a well--known football player, was born in London on May 2nd, 1975. He is about 1.80 metres tall. He is very strong and big. He is quite a good football player. He scored a lot of goals for his old team — the National Football Team of England(英格兰围家足球队). He joined the Real Madrid(皇家马德里对) after he left his old team. He wants to play football in Paris in the next World Cup.

(1)What is David Beckham like?

A. Football.

B. Basketball.

C. Big and strong.

D. Quiet and tall.

(2)What’s the meaning of “well--known”?

A. 著名的.

B. 神奇的.

C. 奇怪的.

D. 优秀的.(3)Which country will hold the next World Cup?

A. France.

B. China.

C. the USA

D. Japan.

(4)Where does David Beckham come from?

A. France.

B. the UK

C. the USA

D. Japan.

(5)Which sentence is wrong?

A. David Beckham is a very good football player.

B. David Beckham scored many goals for the National Football Team of England.

C. David Beckham joined the National Football Team of England after he left the Real Madrid.

D. David Beckham would like to play football in Paris in the next World Cup.

【答案】(1)C

(2)A

(3)A

(4)B

(5)C

【解析】【分析】

(1)细节理解题, 题目提问“他是什么样子的”而不是“他是做什么的”根据文章句子He is very strong and big. 可知答案为C。

(2)词义推测题, 根据上下文well--known为“著名的”的意思, 可知答案为A。

(3)细节理解题, 根据文章句子He wants to play football in Paris in the next World Cup. 可知Paris巴黎是法国首都, 可知答案为A。

(4)细节理解题, 根据文章句子David Beckham, a well--known football player, was born in London故选答案为B。

(5)文章内容理解题, 根据文章内容He joined the Real Madrid(皇家马德里对)after he left his old team. 选答案C。

【点评】考查对篇章的把握和对细节的识别能力,答题时注意紧扣问题中的关键词,在文章中寻找答案。

3.阅读理解

Shenzhen is a city in South China. It's not very big, but it has attracted people of the whole country and the whole world as well.

Just about forty years ago, it was only a small fishing village. There were not many people there. Most of them lived on fishing. Things have greatly changed since the 1980's.It became the first special economic zone(经济特区) in China.

Because of the opening policy(政策), economic exchanges(交流) between China and the outside world have increased greatly. People can come and go easily between Shenzhen and Hong Kong. Both foreigners and Chinese have built a lot of factories, companies and tourists' attractions there. People all over the country have come to find jobs. Many of them have settled down in this new city.

Shenzhen is developing so fast that it has become a well-known city in China now.

(1)About forty years ago, most of the people in Shenzhen ___________.

A. worked in the factories

B. did housework

C. caught fish for a living

D. lived a happy life

(2)What has greatly changed in Shenzhen since the 1980's?

A. Economic exchanges have decreased greatly.

B. People can come and go easily between Shenzhen and Hong Kong.

C. Foreigners and Chinese have built a lot of factories, companies and bridges.

D. People all over the world have come to Shenzhen to find jobs.

(3)What does paragraph(段落)3 mainly talk about?

A. Shenzhen was a small fishing village 40 years ago.

B. Shenzhen has changed greatly because of the opening policy.

C. The opening policy of economic zones in China.

D. The economic exchanges between Shenzhen and Hong Kong.

(4)Which page of the newspaper is this article probably from?

A. Cities

B. Travel

C. Science

D. Shopping

【答案】(1)C

(2)B

(3)B

(4)A

【解析】【分析】文章大意:文章介绍了深圳的过去和现在。

(1)细节理解题,根据Most of them lived on fishing.可知四十年前深圳人捕鱼为生,故答案是C。

(2)细节理解题,根据People can come and go easily between Shenzhen and Hong Kong.可知自从上世纪八十年代深圳巨大的变化是人们可以在深圳和香港之间自由来往,故答案是B。

(3)主旨大意题,根据文章内容可知,深圳自改革开放以来发生的巨大的变化,故答案是B。

(4)文章出处题,根据文章内容可知,改文章来自半只的城市板块,故答案是A。

【点评】考查阅读理解,文章涉及到了细节理解题,主旨大意题和文章出处题,细节理解题可以直接从文章中找到答案,主旨大意题需要在充分连接文章的基础上归纳文章中心,文章出处题主要应根据文章内容来判断。

4.阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项。E

Saving the Earth shouldn't be so difficult,if we can do the following.

First,we should take our time . There is no need to hurry.We can walk or ride a bike to work.

Second,we should smell the Each.Open the windows.Turn off the air-conditioner, and at the same time,save the energy.

Third,we should enjoy cooking at home and having meals on our dinner table.So we can use our own bowls and chopsticks,not the plastic ones.

Fourth,we should spend our weekends and holidays in the park playing games and just riding a bike around.

Fifth,we should learn how to use old things well in the house,in the garden,or in the kitchen.

Lastly, no one really has a mountain and a sea.Don't throw rubbish here and there.

(1)What does the writer think of saving the Earth?

A. It should be safe.

B. It should be difficult.

C. It should be easy.

D. It should be happy.

(2)What do the underlined words "take our time" mean?

A. Be happy.

B. Be slow.

C. Be fast.

D. Be sad.(3)What can we know from the passage?

A. Eating at home can help save the Earth.

B. Opening the windows can help save energy。

C. Not buying new things can save the Earth.

D. Throwing old things away is good for the Earth.

(4)What is the passage mainly about?

A. What does the Earth look like.

B. How to enjoy living on Earth easily.

C. How to protect the Earth in an easy way.

D. How to protect the Earth in an interesting way.

【答案】(1)C

(2)B

(3)A

(4)C

【解析】【分析】短文大意:这篇短文是关于怎样救助地球给出的几点建议。

(1)细节理解题。根据Saving the Earth shouldn't be so difficult。救助地球应该不是太难。故选C。

(2)词意猜测题。根据There is no need to hurry. 不必着急。可知这得慢慢来。故选B。(3)细节理解题。根据we should enjoy cooking at home and having meals on our dinner table.So we can use our own bowls and chopsticks,not the plastic ones.我们应该喜欢在家做饭,在我们的餐桌上吃饭。因此我们能用我们自己的碗和筷子,不是塑料的。可知在家吃饭能节约,也可救助地球。故选A。

(4)主旨大意题。根据文章主题句 Saving the Earth shouldn't be so difficult,if we can do the following.可知这篇文章是关于如何保护地球。故选C。

【点评】此题考查阅读理解。审视标题。这样做有利于对文章的理解能提高做题的效率。快速浏览全文,掌握全貌。如果时间紧,至少要快速通读全文,尤其是首尾两段。再把标题和文章内容结合起来,这样全文的梗概就一目了然了。细读文后的题目。若文章长,为了能迅速抓住要点,可以颠倒过来看,先浏览题目,然后再读文章,这样就可以带着问题去读文章,能加深对要点的理解。细读文章,掌握短文细节。

5.根据短文内容,选择正确答案。

C

The Daily Mirror says that spring comes early but the BBC says it comes late. Who is right? The answer is a bit of both.

We all have an idea of what spring means - many flowers, warmer weather, more rain, birds' singing and so on. If you think when the thrushes (画眉) sing, spring comes, then it's late this year. If you think when flowers come out, spring comes. Then it's early. Bluebells? Spring can be

right on time.

There are many things in spring, but they don't all come at the same time. Some may come early, and some may come late. So we don't define spring by looking at one animal or plant. We must watch many things to define it. Do you think so?

(1)The Daily Mirror says that ______.

A. winter comes early

B. spring comes early

C. winter comes late

D. spring comes late (2)Spring means a lot of things EXCEPT ______ according to the passage.

A. many flowers

B. warmer weather

C. more rain

D. animals' crying (3)What does the underlined word “define” in the last paragraph mean?

A. To make up one's mind.

B. To describe or state clearly what something is.

C. To cause harm to something.

D. To make something grow larger.

(4)The best title of the passage can be ______.

A. Spring Comes Early

B. Spring Comes Late

C. Spring Comes on Time

D. How to Define Spring

【答案】(1)B

(2)D

(3)B

(4)D

【解析】【分析】短文大意:每日镜报说春天会来的早,但是BBC说春天会来的晚,谁说的对呢?答案是两者都有道理。

(1)根据文章第一句 The Daily Mirror says that spring comes early but the BBC says it comes late. 可知B正确。

(2)根据第二段内容We all have an idea of what spring means - many flowers, warmer weather, more rain, birds' singing and so on. 可知选D。

(3)最后一段的意思是“春天有很多东西,但是他们并不都是同时到来,有的来的早一些,有的来的晚一些,所以我们不能只看到一种动物或植物就给春天下定义,我们必须观察好多东西才能给春天下定义。”由此可知difine 是“定义,使明确”的意思,故选B。

(4)整篇文章讲述的是我们如何定义春天,故How to Define Spring可知作文文章的标题,选D。

【点评】这篇文章稍有难度,个别小题需要根据相关内容进行推理总结。首先要认真阅读短文,注意前后联系,掌握短文大意,然后带着问题再读短文,找出相关段落,分析总结,判断出正确选项。文章所设试题主要考查细节查找,做题关键是找出原文的根据,认真核查小题和原文的异同。

6.阅读理解

The Spring Festival is coming. It's the time of the year when children become "rich" again.

A study showed that more than 50% of students from large cities in China got more than 5,000 yuan in lucky money(压岁钱)last year, with 5% getting more than 10,000 yuan.

How did they spend so much money in their little hands?According to the study, 70% of students younger than 12 gave the money to their parents, while 80% of those older than 12 could decide how to use the money by themselves.

Shen Changfeng, a 16-year-old student at Taiziwan Middle School in Nanshan District, could keep her lucky money. She usually spends most of it on stationery such as rulers, pens and books, while the rest might go toward shopping with classmates.

"This year, the most popular gift must be an iPhone XS Max. One of my classmates bought one last week. I'm going to buy one with my lucky money this year." Shen said.

Every term (学期)after winter vacation, students are more likely to buy snacks, video games and gifts for each other, a teacher named Zhang Jie in Qianhai Middle School, Nanshan District, said on Friday.

(1)Who probably got over 5,000 yuan as lucky money last year?

A. A 30-year-old teacher in Beijing.

B. A girl comes from a small village.

C. A 12-year-old student in Shenzhen.

D. An American boy younger than 12.

(2)How many students younger than 12 didn't give their lucky money to their parents according to the study?

A. 20%.

B. 30%.

C. 70%.

D. 80%.

(3)How will probably Shen Changfeng spend her lucky money this year?

A. Give it to her mother.

B. Buy an IPhone XS Max.

C. Go shopping with her parents.

D. Buy a popular book for herself.

(4)What do students like to buy when the new term begins according to Zhang Jie?

A. Interesting video games.

B. Some snacks for their relatives.

C. Rulers and pens for themselves.

D. Beautiful clothes for themselves.

【答案】(1)C

(2)B

(3)D

(4)A

【解析】【分析】大意:本文讲述孩子们怎样支配春节期间获得的压岁钱。

(1)推断题。根据A study showed that more than 50% of students from large cities in China got more than 5,000 yuan in lucky money(压岁钱)last year,可知,50%多的大城市的孩子获得5000元的压岁钱,深圳的12岁的学生可能获得5000多元的压岁钱,故选C。

(2)细节题。根据70% of students younger than 12 gave the money to their parents,可知,30%的学生不给自己的压岁钱父母,故选B。

(3)推断题。根据She usually spends most of it on stationery. such as rulers, pens and books, 可知,她自己保管压岁钱,通常用大多数她的压岁钱买学习用品例如尺子,钢笔和书籍等,推出她今年可能会压岁钱买流行书籍,故选D。

(4)细节题。根据 Every term (学期)after winter vacation, students are more likely to buy snacks, video games.可知,学生可能会买有趣的电子游戏,故选A。

【点评】考查阅读理解。细节题、推断题是阅读理解题中常考题型。细节题需要从文中寻找答案;推断题需要联系上下文,推断出需要的信息。

7.阅读下面短文,从下面每小题的A、B、C、D四个选项中选出最佳选项。

When you are waiting for a bus at a station, a 31-metre-long bus is coming to you. You must be surprised. In fact, the 31-metre-long bus is the longest bus in the world. And the bus comes from Germany. An ordinary bus is only about 10 metres long and it can carry only 80 people once. But the longest bus can carry 256 people. So we will need fewer buses in the future. The longest bus can save energy, too. That's to say, it will take less energy than an ordinary bus. Moreover, the driver can drive the longest bus as easily as an ordinary one.

However, firstly, it has to spend $ 10, 000, 000 buying the longest bus. Someone jokes that we can buy a lot of ordinary buses with that money. Secondly, people think that it is hard for the longest bus to travel on the bustling streets. It may cause new traffic problems. Thirdly, it is easy for someone to get onto the bus without buying a ticket.

(1)How long is the longest bus in the world?

A. 10 metres.

B. 25 metres.

C. 31 metres.

D. 40 metres.(2)How many people can the longest bus carry?

A. 80

B. 156

C. 256

D. 10, 000, 000

(3)What does the underlined word mean in the passage?

A. 繁忙的

B. 宽阔的

C. 长长的

D. 漂亮的(4)Where was the longest bus made?

A. In the US.

B. In China.

C. In Britain.

D. In Germany.

(5)What's the advantage (优点) of the longest bus?

A. It can save energy for people.

B. It cost less money.

C. It's easy for people to drive.

D. It doesn't cause new traffic problems.

【答案】(1)C

(2)C

(3)A

(4)D

(5)A

【解析】【分析】文章大意:本文介绍了一种新型的长的公共汽车。

(1)细节题。根据 the 31-metre-long bus is the longest bus in the world.可知世界上最长的公共汽车是31米长。故选C。

(2)细节题。根据But the longest bus can carry 256 people.可知最长的公共汽车能载256人。故选C。

(3)词义猜测题。根据 people think that it is hard for the longest bus to travel on the bustling streets. It may cause new traffic problems.可知出现交通通行困难,应该是街道里交通车辆及行人多,可猜测出bustling是繁忙的。故选A。

(4)细节题。根据 the bus comes from Germany.可知是德国制造的。故选D。

(5)细节题。根据 The longest bus can save energy可知长公共汽车节约能源。故选A。【点评】考查阅读理解。本文涉及细节题和词义猜测题。细节题要注意细节从文中找答案;词义猜测题是根据上下文,猜测出词义。

8.阅读短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。

We all live on Earth and enjoy our life every day, but you may not be aware of all the fun and interesting facts about the Earth.

The Earth is not round. Do you think the Earth is round? Wrong! Well, it is not completely round.

The Earth is really old. Grandma and Grandpa are old, but the Earth is much older. Scientists think that the Earth is about 4. 5 to 5 billion (十亿) years old.

Much of the Earth is water. About 70% of the Earth is water, and only about 30% of the Earth is land.

Earthquakes happen all the time. Do you know that the Earth has earthquakes all the time? But most of the time, the earthquakes are very small and humans cannot even feel them.

Mount Qomolangma is the highest mountain. There are many mountains on Earth, but Mount Qomolangma is the highest mountain on Earth.

There are so many interesting and fun facts about the Earth, Be sure to check out the sources and see how much you can learn about our awesome (令人惊叹的) planet—the Earth!

(1)The underlined part "be aware of" in Paragraph 1 means "________".

A. welcome

B. know

C. play

D. ring

(2)How many facts are mentioned in the passage?

A. Three

B. Four

C. Five

D. Six

(3)Mount Qomolangma is the ________ mountain on Earth.

A. largest

B. longest

C. smallest

D. highest

(4)Which of the following is NOT true according to the passage?

A. Earthquakes happen three times a year.

B. The Earth is very old

C. About 70% of the Earth is water.

D. The Earth isn't completely round

(5)What's the best title for the passage?

A. The Earth is round

B. Some fun and interesting facts about the Earth

C. Enjoy your life on Earth every day

D. How to feel every earthquake on Earth

【答案】(1)B

(2)C

(3)D

(4)A

(5)B

【解析】【分析】主要讲了关于地球的一些有趣的事实。

(1)推断题。根据前句我们住在地球上,每天享受生活,但是关于地球的一些事实我们可能不知道,所以be aware of意思是知道,即know,故选B。

(2)细节题。根据2到6自然段每段都讲了关于地球的一个事实,所以一共是5个,故选C。

(3)细节题。根据Mount Qomolangma is the highest mountain.可知珠穆朗玛峰是地球上最高的山,故选D。

(4)细节题。根据Earthquakes happen all the time.可知地震一直在发生,但是没说一年三次,故选A。

(5)主旨题。根据全文可知主要讲了关于地球的一些有趣的事实。故选B。

【点评】考查阅读理解。本文涉及细节题、推断题和主旨题三种常考题型,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息;主旨题需要通读全文,了解大意之后找出中心思想。

9.阅读理解

Hello, boys and girls! I'm Helen. The Student Art Festival starts in our middle school. Today is December 13th. There is a photo show(展览). Students take many photos. All of them are great. I love one of the photos a lot. It's a photo of a big family. It's named "Happy Birthday, Grandpa!" I think this student must have a happy family, just like me.

In the next two weeks, we have other fun things-the talent(才艺) show, Chinese painting show and the DIY show. I like the talent show very much. The talent show is on the afternoon of December 19th. My classmate Tony and I will play the piano in the show. Our parents will come and watch the show. I hope we can do well. Do you have time? Please come and watch our show.(1)There is a(n) ________ in Helen's school.

A. sports meet

B. art festival

C. English party

D. book sale

(2)The underlined word "them" refers to(指的是) ________.

A. students

B. shows

C. photos

D. schools

(3)Helen will play the piano with ________.

A. her classmate

B. her mother

C. her teacher

D. her cousin (4)What can we know from the passage?

A. There is a photo show on the second day.

B. There is a basketball game.

C. Helen likes the DIY show very much.

D. There is a talent show on the afternoon of December 19th.

(5)What is the best title for this passage?

A. A photo show

B. A happy family

C. The Student Art Festival

D. A talent show

(2)C

(3)A

(4)D

(5)C

【解析】【分析】文章大意:Helen介绍了学校举行艺术节的一些活动,其中介绍了摄影展,才艺展、国画展和DIY展的相关情况。

(1)细节理解题。根据文中语句 Hello, boys and girls! I'm Helen. The Student Art Festival starts in our middle school.提示可知,在Helen的学校里举行了艺术节,故选B。

(2)词义理解题。根据文中语句Today is December 13th. There is a photo show(展览). Students take many photos. All of them are great. 提示可知,此处的them指代的是前面的photos,故选C。

(3)细节理解题。根据文中语句My classmate Tony and I will play the piano in the show. 提示可知,Helen将与她的同学Tony一起弹钢琴,故选A。

(4)细节理解题。根据文中语句The talent show is on the afternoon of December 19th. 提示可知,在11月19号将举行才艺表演,选项D的描述是正确的,故选D。

(5)理解归纳题。通读全文可知,此文主要介绍了艺术节的一些活动,故选C。

【点评】考查阅读理解。本文涉及细节题、推断题和主旨题三种常考题型,细节题要注意从文中寻找答案;推断题需要联系上下文,推断出需要的信息;主旨题需要通读全文,了解大意之后找出中心思想。

10.阅读理解

Today is October 12th. It's John's 13th birthday. After breakfast, some of his friends come to see him. They give him many nice presents. John is very happy. Then they play basketball for two hours. At noon, they have lunch in a restaurant(餐馆). In the afternoon, they go to the Green Park.

At about 5:30 p.m., he comes back home, John's mother buys a big birthday cake for him. John's name and the words "Happy birthday" are on the cake. John gets some nice presents from his family, too-a yellow T-shirt from his mother, a pair of sports shoes from his father, a CD from his sister, a basketball from his grandfather and a book from his grandmother. How happy John is!(1)How old is John?

A. 10.

B. 11.

C. 12.

D. 13.

(2)Where do John and his friends have lunch?

A. At school.

B. In a restaurant.

C. At John's home.

D. In the Green Park.(3)Who gives John a pair of sports shoes?

A. His mother.

B. His friend.

C. His brother.

D. His father.(4)What does John's grandmother buy for him?

A. A CD.

B. A book.

C. A basketball.

D. A T-shirt.

(5)What is the best title for this passage?

A. John's friends

B. John's family

C. John's birthday

D. John's presents

(2)B

(3)D

(4)B

(5)C

【解析】【分析】文章大意:本文讲述了约翰是如何度过他的十三岁生日的。

(1)细节理解题。根据文中语句It's John's 13th birthday. 提示可知,John十三岁了,故选D。

(2)细节理解题。根据文中语句At noon, they have lunch in a restaurant(餐馆). 提示可知,John在餐馆吃的午饭,故选B。

(3)细节理解题。根据文中语句 a pair of sports shoes from his father, 提示可知,爸爸给John一双运动鞋,故选D。

(4)细节理解题。根据文中语句and a book from his grandmother. 提示可知,奶奶给John 买了一本书,故选B。

(5)标题归纳题。通读全文语句理解可知,此文主要介绍了John的生日是怎样度过的,故选C。

【点评】考查阅读理解。本文主要考查理解判断题,首先仔细阅读文后的问题,弄清问题的大意;然后带着问题阅读短文,抓住关键信息,做出正确判断。

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1 2 =,其中正确的是( ) A .①②③④ B .①②③ C .①② D .③④ 10.下列运算一定正确的是( ) A a = B = C .222()a b a b ?=? D ()0n a m = ≥ 二、填空题 11.已知x =( )21142221x x x x -??+?= ?-+-??_________ 12.若0a >化成最简二次根式为________. 13.若m m 3﹣m 2﹣2017m +2015=_____. 14.定义:对非负实数x “四舍五入”到个位的值记为()f x z , 即:当n 为非负整数时,如果11 22 n x n -<+≤,则()f x n =z . 如:(0)(0.48)0f f ==z z ,(0.64)(1.49)1f f ==z z ,(4)(3.68)4f f ==z z , 试解决下列问题: ①f =z __________;②f =z __________; + =__________. 15.3 =,且01x <<=______. 16.甲容器中装有浓度为a ,乙容器中装有浓度为b ,两个容器都倒出m kg ,把甲容器倒出的果汁混入乙容器,把乙容器倒出的果汁混入甲容器,混合后,两容器内的果汁浓度相同,则m 的值为_________. 17.把 18.=== 据上述各等式反映的规律,请写出第5个等式:___________________________. 19.a ,小数部分是b b -=______. 20.1 =-=

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