宁夏银川一中2019届高三下学期3月第一次模拟考试英语试题 Word版含答案

绝密★启用前

2019年普通高等学校招生全国统一考试

英语试题卷

(银川一中第一次模拟考试)

第一部分：听力理解(共两节。满分30分)

做题时，先将答案标在试卷上。录音内容结束后，你将有两分钟的时间将试卷上的答案

转涂到答题卡上。

第一节 (共5小题：每小题1.5分，满分7.5分)

听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳

选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和

阅读下一小题。每段对话仅读一遍。

例：How much is the shirt ?

A.＄19.15.

B.＄9.18

C.＄9.15

答案是C.

1. Where will the man find his car keys?

A. On the bookcase.

B. In his pocket.

C. On the coffee table.

2. What will the girl be doing tonight?

A. Watching a film.

B. Reading a novel.

C. Eating a meal in the cafeteria.

3. What does the woman offer to do?

A. Help the man’s wife find a doctor.

B. Call an ambulance.

C. Take the man to the hospital.

4. What are the speakers talking about?

A. Where their tent is.

B. Where to set up the tent.

C. How to recognize different trees.

5. What will the woman probably do next?

A. Go shopping.

B. Look at the homework.

C. Go to Hannah’s birthday party.

第二节（共15小题；每小题1.5分，满分22.5分）

听下面5段对话或独白。每段对话或独白后有几个小题，从每题所给的A,B,C三个选

项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。

请听第6段材料，回答第6至7题。

6. How did the woman feel when she took the test?

A. Pleased.

B. Relaxed.

C. Nervous.

7. How long did the woman think the test was?

A. Three pages long.

B. Four pages long.

C. Five pages long.

请听第7段材料，回答第8至9题。

8. What time does the conversation take place?

A. At 2:00 p.m.

B. At 6:00 p.m.

C. At 7:00 p.m.

9. Why is the woman excited about her visit to Washington D.C.?

A. She will do some important business.

B. She will visit some of her friends there.

C. It’s her first time to travel there.

请听第8段材料，回答第10至12题。

10. What does the man want to do?

A. Buy office supplies.

B. Get a birthday gift.

C. Buy his father a gift.

11. What’s the relationship between the speakers?

A. Co-workers.

B. Boss and employee.

C. Shop owner and customer.

12. What does the woman suggest?

A. A trip to the office supplies store.

B. A shopping trip downstairs.

C. A couple of shopping trips.

请听第9段材料，回答第13至16题。

13. What does the woman learn from the man’s resume?

A. He works well in a group.

B. He has a lot of experience.

C. He is naturally curious.

14. What does the man say about his weaknesses?

A. He can be unsure of himself at first.

B. He is hard to get along with sometimes.

C. He doesn’t like having to do training.

15. What does the woman ask about the man’s future?

A. If he will be married.

B. Whether he will be suitable for the company.

C. What he will have accomplished in a few years.

16. Why does the woman appear impressed?

A. The man challenged her.

B. The man gave good answers.

C. The man already understands the job.

请听第10段材料，回答第17至20题。

17. What does the term “college students” mean in America?

A. Students only in colleges.

B. Students only in universities.

C. Students either in colleges or in universities.

18. Which school does the most research?

A. An institute.

B. A university.

C. A college.

19. What do we know about MIT?

A. It offers programs on the arts.

B. It is part of a university.

C. It has more than 75 different programs.

20. What’s the main purpose of the speech?

A. To learn something about the institute.

B. To find out the differences between colleges and universities.

C. To discuss the differences between American English and British English. 第二部分阅读理解（共两节，满分40分）

第一节（共15小题；每小题2分，满分30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

A

Hiking is a great way to get active and reduce stress while you are exploring the city.Visit our page to find some of the best free walking tours across New York City.

Community Days at Conference House Park

Wednesday ,September 19, 2018 12:00p.m.---2:00p.m.

Enjoy new gardens at the Visitor Center. Explore and help repair the three self-designed gardens: vegetable, native plant, and sculpture. Experience kids crafts，adult art programs, Tai Chi and more in this lovely setting.

Position: Conference House Park, 298 Satterlee Street, Staten Island

Event Organizer: Conference House Park

Phone Number: (718)227-1463

Contact Email: john.kilcullen@parks .nyc.qov

Greenbelt on the Go

Tuesday, August 14, 2018 10:00a.m.---11:30a.m.

Join us for relaxing walks through our parks. Enjoy the pretty views of them, as we point out a few of the distinct features that make each park special. The length of each hike will be determined by the pace of the group. Registration is required.To register, please email naturecenter@https://www.wendangku.net/doc/158151895.html, before August 14.

Position: Greenbelt Nature Center in Blood Root Valley, 700 Rockland Avenue at Brielle Avenue Staten Island

Event Organizer: Staten Island Greenbelt Conservancy, Greenbelt Environmental Education Department

Phone Number: (718)351-3450

Contact Email: naturecenter@https://www.wendangku.net/doc/158151895.html,

Adult Afternoon Hikes

Wednesday, October 10,2018 1:30p.m.---3:00p.m.

Get familiar with the Greenbelt and local p arks by hiking with other adults !You’re encouraged to bring small meals and drinks for the break time.

Position: Greenbelt Nature Center in Blood Root Valley, 700 Rockland Avenue at

Brielle Avenue Staten Island

Event Organizer: Staten Island Greenbelt Conservancy, Greenbelt Environmental Education Department

Phone Number: (718)351-3450

Contact Email: naturecenter@https://www.wendangku.net/doc/158151895.html,

The South Pole at Wards Point

Thursday ,November 15,2018 7:00a.m.---7:00p.m.

The three miles of nearby natural shoreline are a sandy beach. Shells ,rocks , and stones of every shape and size can be found here. Not to be missed are the park’s other attractions: acres of woodland ,four galleries, and five historic houses! Position: Conference House Park Visitor Center in Conference House Park ,298 Satterlee Street ,Staten Island

Event Organizer: Conference House Park

Contact Email: john.kilcullen@parks .nyc.qov

21. Which walking tour may attract people interested in Chinese culture?

A. Community Days at Conference House Park

B. Greenbelt on the Go

C. Adult Afternoon Hikes

D. The South Pole at Wards Point

22. What do we know about Greenbelt on the Go?

A. The length of the hike is settled

B. People will visit three distinct parks

C. It takes place in Conference House Park

D. Visitors need to register in advance

23. What do the four walking tours have in common?

A. They are all for adults.

B. They all charged no fees

C. They’re held by the same organizer.

D. They require visitors to bring food.

B

Judy Wright and her husband decided to move closer to their son, Chris ,who lived

in Georgia. About a month after the move ,Judy fell ill, suffering from her ongoing battle against Parkinson’s disease.

Her condition worsened rapidly and she required medical care at home. The family hired a nursing aid who canceled at the last minute. Instead , a woman named TunDe Hector showed up in her place.

One day, TunDe shared a story with Judy and her family. She remembered a particularly difficult day in 2014, when a stranger had helped her with a kind gesture. She had run out of gas, and with only$5 in her pocket ,was walking to a gas station, gas can in hand. A man saw her walking and turned his car around. He paid for her gas and gave her all the cash left in his wallet. Upon hearing the story , Judy’s son, Chris, took off his hat and said ,"That was me!” He was the stranger that had helped TunDe on that difficult day.

During the care of Judy, the Wright family learned about TunDe’s family and her own dream. The nursing aid, TunDe hoped that one day she could become an OB-GYN nurse.Her tuition was past due（逾期） and she had a family to care for, but she was determined to achieve that goal for herself and her family.

Judy died on July 9,2017. Instead of flowers, her family asked mourners(悼念者）to donate to TunDe’s education , to assist her in paying for her nursing school. In less than a week, they raised more than $8,000 and presented her with the surprise check.

24. Why did Judy’s family choose TunDe in the end?

A. To help her with a kind gesture .

B. To replace another nursing aid.

C. To look after Judy in the hospital

D. To give Judy the best medical care

25. How might Chris feel when hearing TunDe’s story?

A. Shocked

B. Thrilled

C. Puzzled

D. Delighted

26. How did the Wright family help TunDe after Jud y’s death?

A. They paid for her education

B. They helped care for her family

C. They helped her realize her dream.

D. They bought her a surprise present

27. What does the whole story mainly tell us ?

A. Kindness comes full circle

B. Actions speak louder than words.

C. The truth never fears investigation

D. Constant dropping wears stone.

C

A study showed that the experiences children have in their first few years are important . These experiences affect the development of the brain. When children receive more attention, they often have higher IQs. Babies receive information when they see, hear and feel things, which makes connections between different parts of the brain. There are a hundred trillion(万亿）connections in the brain of a three-year-old child.

Researcher Judit Gervain tested how good newborns are at distinguishing different sound patterns. Her researchers produced images of the brains of babies as they heard different sound patterns. For example, one order was mu-ba-ba. This is the pattern"A-B-B". Another order was mu-ba-ge. This is the pattern “A-B-C”. The images showed that the part of the brain responsible for speech was more active during the" A-B-B"pattern. This shows that babies can tell the difference between different patterns. They also were sensitive to where it occurred in the order.

Gervain is excited by these findings because the order of sounds is the building block of words and grammar."Position is key to language," she says. "If something is at the beginning or at the end, it makes a big difference:'John caught the bear.' is very different from 'The bear caught John.'”

Researchers led by scientist Patricia Kuhl have found that language delivered by televisions, audio books,the Internet, or smartphones－no matter how educational －doesn’t appear to be enough for children’s brain development. They carried out a study of nine-month-old American babies. They expected the first group who’d watched videos in Chinese to show the same kind of learning as the second group who were brought face-to-face with the same sounds. Instead they found a huge difference. The babies in the second group were able to distinguish between similar Chinese sounds as well as native listeners. But the other babies －regardless of whether they had watched the video or listened to the audio－learned nothing.

28. What makes connections in a baby’s brain?

A. Having a higher IQ.

B. Experiencing new information

C. The baby’ early age

D. The connection with other babies

29. What did Judit Gervain and her team find in the experiment?

A. Babies identify different sound patterns.

B. Word order is relevant to meaning.

C. Babies can well understand different words.

D. A certain brain region processes language.

30. What does the underlined sentence mean in Paragraph 3?

A. Grammar is important in learning languages.

B. Different orders have different meanings.

C. Different languages have different grammar.

D. Words have different sounds.

31. What is the main conclusion from the study led by Patricia Kuhl?

A. Babies shouldn’t watch a lot of television.

B. Listening to different languages develops babies’ brain

C. Foreign languages help babies’ brain develop

D. Social communication improves babies’ brain development.

D

On average ,Americans spend about 10 hours a day in front of a computer or other electronic devices and less than 30 minutes a day outdoors. That is a claim made by David Strayer, a professor of psychology at the University of Utah. In his 2017 TED Talk , Strayer explained that all this time spent with technology is making our brains tired.

Using an electronic device to answer emails, listen to the news and look at Facebook puts a lot of pressure on the front of the brain, which, Strayer explains , is important for critical (有判断力的）thinking , problem-solving and decision-making.

So, it is important to give the brain a rest. And being in naure , Strayer claims , helps get a tired brain away from too much technology. More than 15,000 campers from

around the world attended an international camping festival in September. That is when friends and family take time off and escape to nature for several days. They take walks, climb, explore , swim, sleep, eat and play. Camping may be just what a tired brain needs.

Take Carl for example .He lives in West Virginia and enjoys camping . He says that staying outdoors makes him feel at ease. It also prepares him for the work he must do. Kate Somers is another example who also lives in West Virginia. She says she enjoys camping with her husband and two children . She calls it a “regenerative” experience.

At the University of Utah , David Strayer has studied both short-term and long-term exposure to nature. He found that spending short amounts of time in nature without technology does calm the brain and helps it to remember better. However ,he found , it is the long-term contact with nature that does the most good. He and his research team found that spending three days in nature without any technology is enough time for the brain to fully relax and reset itself.

32. What is David Strayer’s opinion ?

A. Americans dislike outdoor activities

B. Electronic equipment should be quitted

C. New technologies are a double-edged sword

D. Electronic equipment brings great convenience

33. Why does Strayer insist we go outdoors?

A. To try another lifestyle

B. To refresh our brain

C. To make better decisions.

D. To play with our family and friends

34. What does the underlined word “regenerative” mean?

A. Reborn

B. Memorable

C. Remarkable

D. Tiring

35. Which is the proper title for the passage?

A. Electronic Equipment Harms the Brain

B. Good Rest Develops Good Memory

C. Tips on Using New Technologies

D. Being in Nature Is Good for the Brain

第二节（共5小题；每小题2分，满分10 分）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

After a long day at work, coming home is a breath of fresh air. Home is a comfortable place to sit back and relax. __36__ Below are a number of things we can do to create a healthy home environment that will help to ease the workday stress and promote our physical and mental health.

Cleaning the house regularly is the first thing we should do. It may seem like a tiring thing to clean but there is a reason for doing so. We can remove dust by cleaning the house. Leaving layers of dust everywhere means that there is a build-up of dust. And where do these layers of dust go?__ 37__

Making sure the rooms are full of sunlight is also important. We may not realize it but sunlight is an important part of our growth. We all know that sunlight promotes better working conditions. __38___ Think about using a Parans system where sunlight does not reach. This technology gathers the sunlight by using solar panels. It can send out sunlight wherever we are.

__39__ Going green will help to remove toxins(毒素）in the air. They also give off oxygen, which can lower stress and improve our moods.

Along the lines of being green, it can also be vital to think about what things we are bringing into the house. Try to avoid specific plastics that are harmful to health. __40__ They may contain poisonous chemicals that can be breathed in, or simple absorbed through the skin.

A. However，is it as healthy as it can be?

B. Is our home as comfortable as it used to be?

C. Into our lungs.

D. The same thing applies to certain carpets and paint.

E. Besides, it can reduce both stress and high blood pressure.

F. It is also a good idea to add more plants in our house.

G. It is acknowledges that a greener lifestyle is linked to better health. 第三部分英语知识运用（共两节，满分45分）

第一节完形填空（共20小题：每小题1.5分，满分30分）

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白

处的最佳选项，并在答题卡上将该项涂黑。

I always come across random acts of kindness in my life. Many years ago, I was ___41__Costa Rica when I found myself in an __42___situation: my credit cards and bank cards went out of ___43____ abroad, and I only had $5 to my ___44___.

I had no way to get money. I didn’t know anybody in this country. I only knew basic Spanish, and besides the cash the only ___45___I had was a return ticket to my country in almost two ___46___. Back then, there was no such thing as mobile phones, and___47___email was very limited. To find help, I decided to go to the countryside . With the only coins I had, I ___48____the bus terminal(终点站）and found a village, which ___49___almost the exact amount. About 4 hours later, I arrived at Santa Rosa Abajo at midnight.

I knocked door to door,___50___in my very poor Spanish that I was a foreigner travelling in Costa Rica with no money but I ___51___to stay here for over ten days.

I begged them for a ____52____－such as cooking , cleaning and looking after their kids, anything like that. Everybody ___53____, “oh my, but so poor are we that we have no __54___ food or space. Maybe you can try the next __55____.” And they’d point me to another house.

____56___, I arrived at a Chinese restaurant. The owner of the restaurant was very ____57___. She gave me food and called the Red Cross to come to ___58___me. With the help of the Red Cross , I spent my___59____days in Costa Rica.

This is one of the best trips I’ve ever had, because I realized that when you’re in a position to be able to ____60___, it actually makes you feel happy. 41. A. circling B. considering C. entering D. visiting

42. A. absurd B. impossible C. awkward D. ordinary

43. A. use B. range C. control D. date

44. A. advantage B. wonder C. name D. credit

45. A. necessity B. possession C. memory D. impression

46. A. hours B. days C. weeks D. months

47. A. again B. even C. yet D. thus

48. A. looked for B. headed to C. stayed at D. thought of

49. A. created B. earned C. saved D. cost

50. A. explaining B. reminding C. apologizing D. informing

51. A. managed B. needed C. failed D. agreed

52. A. job B. meal C. room D. conversation

53. A. accepted B. nodded C. replied D. withdrew

54. A. extra B. cheap C. prepared D. wasted

55. A. time B. chance C. family D. restaurant

56. A. Normally B. Naturally C. Directly D. Finally

57. A. sensible B. rich C. confident D. generous

58. A. rescue B. comfort C. interview D. encourage

59. A. frightening B. training C. exciting D. remaining

60. A. help B. receive C. succeed D. travel

第二节（共10小题；每小题1.5分，满分15分）

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Two new satellites of BeiDon Navigation(导航) Satellite System (BDS) ___61___ (send) into space on a Long March-3D carrier rocket from the Xichang Satellite Launch Center in Sichuan Province, China at 2: 07 a.m. on November 19,2018. The satellites entered a Medium Earth orbit___62____ (safe) more than three hours later and will work with 17 other BDS-3 satellites already in space. They are also the 42nd and 43rd___63____ (member) of the BDS satellite family.

China launched these satellites with ___64___ aim of providing navigation services for countries and regions which participate in the Belt and Road Proposal by the end of 2018. “This is a key step for BDS developing ___65___ a Chinese experimental system to a regional and then a ___66___ (globe) navigation system,” said Yang Changfeng, chief designer of the BeiDou system. The positioning ___67___ (accurate) of the BDS-3 system has been improved to 2.5 meters to 5 meters, said

Yang.

___68___ (name) after the Chinese term for the Plough, the BeiDou system has been serving China for 18 years ___69___ another six BDS-3 satellites will be put into the Medium Earth orbit from 2019 to 2020. The system is expected ___70___ (provide) first-class services around the globe by the end of 2020.

第四部分写作(共两节，满分35分)

第一节短文改错（共10小题；每小题1分，满分10分）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处.每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号( ) 并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

Our class joined in a meaningful activity during the winter vacation. First, we went to visit the old lady who lived all alone. Some chatted with her but others helped do a thorough cleaning for us. When the work was done, the house looked real neat and tidy. Then we went to the sport center, where all equipment needed polished. We set out to work at once. Everything was dust-free at no time. Having done all this, we saw a pleasant community than before. Tiring as we were, we felt happy as all of our work was paid off.

第二节书面表达（满分25分）

近期，某校组织高三学生进行了一场讨论。主题是：高三年级要不要集中进行晚自习。根据下图提供的信息，写一篇英语短文，客观地介绍一下讨论的情况，注意要涵盖所有要点。

注意：

1. 词数不少于100（开头和结尾已给出，但不计入总词数）；

2. 可以适当增加细节，以使行文连贯。

晚自习evening self-study

Recently there was a heated discussion among Senior 3 students in our school. _____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

Yours sincerely,

Li Hua

银川一中2019届高三第一次模拟英语参考答案

一、1-5 CCBAA 6-10 BAACC 11-15 ABBAC 16-20 BCBAB

二、阅读

A: A D B B: B A C A

C: B A B D D: C B A D 36-40 ACEFD

三、完形填空 41-45 DCACB 46-50 CBBDA 51-55 BACAC 56-60 DDADB

四、语法填空

61.were sent 62.safely 63. members 64. the 65.from

66. global

67. accuracy 68. Named 69.where 70. to provide

五、短文改错

71. visit the old lady改为an 72. but改为and/while

73. cleaning for us改为her 74.real改为really 75. sport改为sports

76. polished改为polishing 77. at no time改为in 78. pleasant community前面加more

79. Tiring改为Tired 80. our work was paid off删掉was

六、书面表达

Recently there was a heated discussion among Senior 3 students in our school. The students were questioned whether they were willing to have the evening self-study at school or not. Here is the result according to the survey.

60 percent of the students think it’s a good idea to have the evening self-study at school. They think they can do better in their study with the help of the teachers. Also, they can concentrate on their lessons better in the classroom and with company of their fellow classmates. There are 25 percent of the students who think they prefer to study at home. They suppose that they may get disturbed by others and there are possible dangers on their way home alone. At the same time, still 15 percent of the students don’t have a clear answer to the question. They say they will go to school to have evening self-study if they are asked to, but they promise they can also do well at home.

宁夏银川一中2019届高三第一次模拟考试数学(理)

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一、等比数列选择题 1．已知等比数列{}n a 中，n S 是其前n 项和，且5312a a a +=，则4 2 S S =（ ） A ．76 B ．32 C ． 2132 D ． 14 2．设{a n }是等比数列，若a 1 + a 2 + a 3 =1，a 2 + a 3 + a 4 =2，则 a 6 + a 7 + a 8 =（ ） A ．6 B ．16 C ．32 D ．64 3．若1，a ，4成等比数列，则a =（ ） A ．1 B ．2± C ．2 D ．2- 4．中国古代数学著作《算法统宗》中有这样一个问题：“三百七十八里关，初行健步不为难，次日脚痛减一半，六朝才得到其关，要见次日行里数，请公仔细算相还.”你的计算结果是（ ） A ．80里 B ．86里 C ．90里 D ．96里 5．在3和81之间插入2个数，使这4个数成等比数列，则公比q 为（ ） A ．2± B ．2 C ．3± D ．3 6 ． 12 与1 2的等比中项是（ ） A ．－1 B ．1 C ． 2 D ．2 ± 7．已知等比数列{}n a 的前n 项和为n S ，若2 13a a =，且数列{}13n S a -也为等比数列，则 n a 的表达式为（ ） A ．12n n a ??= ??? B ．1 12n n a +??= ??? C ．23n n a ??= ??? D ．1 23n n a +??= ??? 8．各项为正数的等比数列{}n a ，478a a ?=，则2122210log log log a a a +++=（ ） A ．15 B ．10 C ．5 D ．3 9．数列{}n a 是等比数列，54a =，916a =，则7a =（ ） A ．8 B ．8± C ．8- D ．1 10．在数列{}n a 中，32a =，12n n a a +=，则5a =（ ） A ．32 B ．16 C ．8 D ．4 11．已知等比数列{}n a 的前n 项和为n S ，若123 111 2a a a ++=，22a =，则3S =（ ） A ．8 B ．7 C ．6 D ．4

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宁夏银川一中2020 届高三第五次月考理科综合能力测试 化学试题 1.废电池投入的垃圾桶上应贴有的垃圾分类标志是 A B C D A. A B. B C. C D. D 【答案】A 【解析】 【分析】 废旧电池能严重污染水体和土壤，所以废干电池实施集中处理，以防止对水源和土壤的污染，它不属于金属，不能够燃烧，不属于玻璃材料，所以属于有害垃圾。 【详解】A．图示标志为有害垃圾，故A正确； B．图示标志为可回收垃圾，故B错误； C．图示标志为餐厨垃圾，故C错误； D．图示标志为其它垃圾，故D错误； 故选：A。 2.用N A代表阿伏加德罗常数的数值。下列说法正确的是 A. 3.6 g CaO2晶体中阴离子的数目为0.1N A B. 将7.1 g Cl2通入水中，转移电子数为0.1N A C. 标准状况下，11.2 L O2和CO2混合气体含有的氧原子数为N A D. 室温下，1L pH＝13的NaOH溶液中，由水电离出的OH－的数目为0.1N A 【答案】C 【解析】

【详解】A.3.6g过氧化钙的物质的量为0.05mol，而1mol过氧化钙中含1mol阴离子，故0.05mol 过氧化钙中含0.05N A个阴离子，故A错误。 B．氯气与水反应为可逆反应，不能进行到底，所以将7.1 g Cl2通入水中，转移电子数小于0.1N A，故B错误； C．O2和CO2均含两个氧原子，标准状况下，11.2 L O2、CO2混合气体物质的量为0.5mol，含有的氧原子数为N A，故C正确； D．在氢氧化钠溶液中，氢原子的物质的量浓度为10-13mol/L，全部来自于水的电离，而水电离出的氢氧根的浓度等于水电离出的氢离子的浓度，故pH=13的氢氧化钠中，水电离出的氢氧根的个数为10-13N A ，故D错误； 故答案为C。 3.下列反应 的离子方程式正确的是A. 碳酸钠的水溶液呈碱性：CO32-＋2H2O H2CO3＋2OH－B. 用CH3COOH溶解CaCO3：CO32-+CH3COOH=CH3COO-+H2O+CO2↑ C. 向Fe (OH)3胶体中加入氢碘酸溶液：Fe(OH)3+3H+=Fe3++3H2O D. 氯化亚铁溶液中通入氯气：2Fe2++Cl2=2Fe3++2Cl- 【答案】D 【解析】 【详解】A、碳酸钠水溶液呈碱性的原因是因为碳酸根离子水解：CO32-+H2O HCO3-+OH-；故A错误； B、醋酸是弱电解质，写化学式，离子方程式为 CaCO3+2CH3COOH═Ca2++H2O+CO2↑+2CH3COO-，故B错误； C、向Fe（OH）3胶体中加入氢碘酸溶液，二者发生氧化还原反应，正确的离子方程式为：2Fe （OH）3+6H++2I-=2Fe2++I2+6H2O，故C错误； D. 氯化亚铁溶液中通入氯气，氯气氧化亚铁离子，离子方程式为：2Fe2++Cl2=2Fe3++2Cl-，故D正确； 故答案为D。 【点睛】注意明确离子方程式正误判断常用方法：检查反应物、生成物是否正确，检查各物质拆分是否正确，如难溶物、弱电解质等需要保留化学式，检查是否符合原化学方程式等。 4.某铁的氧化物（Fe x O）1.52g溶于足量盐酸中，向所得溶液中通入标准状况下112mlCl2，恰好将Fe2+完全氧化。x值为（）

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