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安徽省合肥市第九中学2019-2020学年高二英语下学期第二次月考试题[含答案]

安徽省合肥市第九中学2019-2020学年高二英语下学期第二次月考试

题

满分：120分考试时间：90分钟

第一部分听力（共两节，满分30分）

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。

1．What does the woman want to do?

A．Graduate next semester. B．Get the form back. C．Meet the dean.

2．Where are the speakers now?

A．In a building. B．On a bridge. C．In a car.

3．What are the speakers mainly talking about?

A．Sports. B．A park. C．A summer holiday.

4．What does the man remind the woman to pay?

A．The phone bill. B．The water bill. C．The electricity bill.

5．What does the woman mean?

A．She didn’t like the watch.

B．She bought the watch for $50.

C．She didn’t have enough money.

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。听毎段对话或独白前，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。

听第6段材料，回答第6—7题。

6．What’s the probable relationship between the speakers?

A．Teacher and student. B．Colleagues. C．Classmates.

7．What does the woman plan to do right after lunch?

A．Find Ms. Wong. B．Go to the gym. C．Have a PE class.

听第 7 段材料，回答第 8 至 9 题。

8．Why does Mary call Mr. Green?

A．To ask about a meeting. B．To make an appointment.

C．To remind him to see a dentist.

9．When will Mr. Green attend a parent-teacher meeting?

A．On Thursday morning. B．On Thursday afternoon. C．On Friday afternoon.

听第 8 段材料，回答第 10至 12 题。

10．What are the speakers most probably doing?

A．Booking a hotel.

B．Writing a hotel review.

C．Reading a brochure of a hotel.

11．What does the man like most?

A．Open fires. B．Afternoon tea. C．The bedroom.

12．What do the speakers decide to do?

A．Send a letter. B．Ask for a price list. C．Bargain over the price.

听第 9 段材料，回答第 13 至 16题。

13．Where does the conversation take place?

A．At a cafe. B．At an airport. C．On the phone.

14．How does Nick sound?

A．Worried. B．Curious. C．Excited.

15．Why will Mary go to San Diego?

A．To study in a university. B．To spend a vacation. C．To see her sister. 16．What time is it now?

A．About 6:00. B．About 7:00. C．About 8:30.

听第 10 段材料，回答第 17 至 20 题。

17．What will the listeners do first at the Cookery School?

A．Make some pizza. B．Eat chocolate cakes. C．Learn to grow vegetables. 18．What’s the price of the bus ticket?

A．$3.55. B．$6.00. C．$9.55.

19．What should the listeners take?

A．Sandwiches. B．A notebook. C．A pencil.

20．How are the parents advised to contact the speaker?

A．By e-mail. B．Through the phone. C．Face to face.

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和D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

The Bill & Melinda Gates Foundation[BMGF] said this week it will provide up to $100 million to support action against the 2019 novel coronavirus. It says the money will help strengthen efforts to test people for the virus, separate healthy individuals from the sick and find treatment for them.

Controlling the epidemic: The donat ion will help speed development of the “tools to bring this epidemic under control,” the chief executive officer of the Gates Foundation; Mark Suzman said.

Worldwide emergency: The Gates Foundation is giving money and working with other donors to help the World Health Organization (WHO), Chinese medical workers and others worldwide. It noted the need for an organized international effort to fight the virus.

Increased efforts to find and treat the coronavirus: The foundation promised $20 million right away to hurry the process of identifying those who are sick, keeping them separate, and helping them get better. The goal is to stop the disease from spreading to more people and places. Money is also going to public health officials in China and other countries with coronavirus patients to help them pay the start-up cost of medical workers and supplies.

Protecting at-risk groups in Africa and South Asia: Recent epidemics, such as the H1N1 influenza pandemic of 2009, have had a big effect on people living in extreme poverty. Most of those people live in African countries south of the Sahara Desert or parts of South Asia. Another $20 million is going to public health officials in these areas to improve their emergency operations and to treat confirmed cases. One partner is the African Field Epidemiology Network, a non-profit service that currently

operates in more than 30 African countries.

Developing Vaccines: Of the total donation, $60 million will go to speed the process of making vaccines to protect against the novel coronavirus. One organization working on developing the anti-coronavirus vaccines is the Coalition for Epidemic Preparedness Innovations with Chinese public- and private-sector researchers; trying to find ways to stop the spread of the virus.

21．The money donated by the BMGF will be used in the following aspects except______ A．to build a new hospital in China B．to separate the healthy from the sick C．to test people for the virus D．to find treatment for the virus -infected 22．Which of the following statements is true?

A．The money is specially donated to China’s public health department.

B．Another $20 million will be used to help African people suffering from starvation.

C．Most of the donated money will be put into the developing and innovating vaccines.

D．The African Field Epidemiology Network is a non- profit medical service organization only in western Africa.

23．The passage is most probably digested from ___.

A．a poster B．a magazine C．a text book D．a news report

After spending a year in Brazil on a student exchange program, her mother recalled, Marie Colvin returned home to find that her classmates had narrowed down their college choices. “Everyone else was already admitted to college,” her mother, Rosemarie Colvin, said from the family home. “So she took our car and drove up to Yale and said , ‘You have to let me in .’ ”

“Impressed--she was a National Merit ( 英才) finalist who had picked up Portuguese in Brazil—Yale did, admitting her to the class of 1978, where she started writing for the Yale Daily News and decided to be a journalist,” her mother said.

On Wednesday, Marie Colvin, 56, an experienced journalist for The Sunday Times of London, was killed as Syrian forces shelled( 炮击) the city of Homs. She was working in a temporary media center that was destroyed in the attack.

“She was supposed to leave Syria on Wednesday”, Mrs. Colvin said. “Her editor told me he called her yesterday and said it was getting too dangerous and they wanted to take her out. She said she was doing a story and she want ed to finish it.”

Mrs. Colvin said it was pointless to try to prevent her daughter from going to conflict zones. “If you knew my daughter,” she said, “it would have been such a waste of words. She was determined, she was enthusiastic about what she did, and it was her life. There was no saying ‘Don’t do this.’ This is who she was, absolutely who she was and what she believed in: cover the story, not just have pictures of it, but bring it to life in the deepest way you could.” “So it was not a surprise when she took an interest in journalism,” her mother said.

24．From the underlined sentence in Paragraph 1, we can infer that .

A．Yale was her last choice

B．Marie Colvin was good at persuading

C．Yale must keep its promise to Marie Colvin

D．Marie Colvin was confident of herself

25．Which of the following is the correct order to describe Marie Colvin’s life ?

a. She was doing a story in Syria and got killed.

b. She was admitted to Yale University.

c. She studied in Brazil as an excellent student.

d. She was hired by The Sunday Times of London.

e. She began to take an interest in journalism.

A．d→e→c→a→b B．c→b→e→d→a

C．e→d→c→b→a D．b→c→d→e→a

26．From the last paragraph, we can know that Mrs. Colvin .

A．dislikes the choice of her daughter.

B．knows her daughter very well.

C．cares little about her daughter.

D．doesn’t fully appreciate her daughter.

27．What can be the best title of the text ?

A．Recalling Her Daughter, a Journalist Killed in Syria.

B．Applying for Top Universities, a Successful Case

C．Choosing Lifelong Careers Based on Your Own Interest.

D．Covering Stories in a Dangerous Conflict Area.

The end of the school year is in sight - Christmas cards, candy canes and of course, end of year reports．

While most parents welcome an assessment of their kids' performance, they do not expect their own input to be evaluated. But a school in the UK is changing that. As well as assessing their students, they are dishing out grades to mums and dads. Parents that are really involved in their kids' education are rewarded with an A, and parents that haven't done their bit get a disappointing D．

The school, Greasley Beauvale Primary in Nottinghamshire, uses standard such as whether mums and dads have attended school events such as plays and parent teacher evenings to decide on the grade. The school's principal, Donna Chambers， said that the scheme had been well received．

"There were some critics. In spite of it, between 15 percent and 20 percent of parents started out in the lower categories but now that has been reduced to just two per cent," she explained．

Chambers hopes that the scheme will help motivate parental involvement. "The system is important because you have got to get the parents on board from day one. That one hour initial conversation saying they could improve will make a difference

to the rest of that child's academic life", she said.

But while the scheme may be well intentioned, it is likely to be connected with parent shaming. There are lots of reasons why some mums and dads might not be involved in school activities such as work commitments, looking after younger children or caring for elderly relatives.

And of course, being involved in your kid's education doesn't begin and end at school. There is a lot that goes on behind the scenes from helping with homework to keeping uniforms freshly laundered. And what about all the parents who stayed up sewing special costumes at the last minute? Surely that earns a gold star instead of a grade!

28．What do schools usually do at the end of the school year? ______

A．Dividing candies．

B．Making Christmas cards．

C．Evaluating kids' performances．

D．Grading parents．

29．What does the school's principal Chambers say about the scheme? ______ A．It uses a new way to evaluate kids．

B．It gives parents further education．

C．It has gained much acceptance．

D．It improves kids' motivation for learning．

30．What does the author think of parents being involved in kids' education? ______ A．It means far more than being graded．

B．It brings shame to parents．

C．It adds to parents' burden．

D．It increases parents' commitment to education．

31．What is the passage mainly about? ______

A．There is too much stress for parents about their children's academic life.

B．Parents as well as their children are on the list of the year school report.

C．Parents should be involved in children's school life.

D．Whether a parent is excellent depends on the grade he gets.

Sleep is essential for a person’s wellbeing. Researchers have found that sleep loss increases a person’s risk of developing serious medical conditions. Now, a new study has found that getting enough sleep is also the key to improving academic performance.

Jeffrey Grossman, who led the research, was not trying to find the correlation (相关性) between sleep and grades when he handed out Fitbits to the students in his class. Instead, the professor hoped the popular wrist-worn electronic device (装置), which tracks a person’s activity 24/7, would show a connection between physical exercise and academic achievement.

As part of the research, a quarter of the participants chose a fitness class specially created for the study. After the school term ended, the researchers

carefully analysed the data. Much to Grossman’s surprise, they found no measurable difference in test performance between the group that had been physically active and the group that had not.

However, the study presented a surprising viewpoint in the journal Science of Learning. Going through the large amount of data, Grossman noticed an interesting trend (走向) from the participants sleep patterns. There was a straight-line relationship between the average amount of sleep and his/her grade on the exams.

Besides, it was not enough for students to just head to bed early the night before a test. Grossman says: “We’ve heard the phrase ‘Get a good night’s sleep, you’ve got a big day tomorrow.’ It turns out this does not relate at all to test performance. Instead, it’s the sleep you get during the days when learning is happening that matters most.”

The time students went to bed each night was similarly important. Those who went to bed in the early hours of the morning performed poorly, even if the total sleep time was the same as a higher-performing student.

The research does not prove that sleep is the only component that helps improve academic performance. However, Grossman says the results are a strong indication that sleep really matters. Who knew getting A’s just required some extra ZZZ’s?

32．What’s Grossman’s original purpose by using Fitbits in the research?

A．To improve students sleep patterns.

B．To find effects of physical exercise on grades.

C．To monitor students’ physical condition.

D．To regulate students’ daily behavior.

33．What did Grossman think of the research result?

A．It was unreliable. B．It was changeable

C．It was unexpected. D．It was fruitless.

34．What plays a more important part in test performance?

A．Average amount of sleep during tests. B．Sleep in the learning stage.

C．Sleep quality the night before the test. D．A regular bedtime.

35．What is the best title for the text?

A．Enough Sleep Benefits Our Wellbeing

B．Be Physically Active and Sleep More

C．Catch ZZZ’s for Good Test Performance

D．The More Exercise, the Better Schoolwork

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。

Many of us are hardwired NOT to ask for help. We think it makes us appear weak. We think people will say no. we think we have to do everything ourselves. 36 . We have to get over that, and there’s how:

Get over yourself

No one—and I mean NO ONE----got anywhere alone. You cannot and should not do everything yourself. You are not, in fact, always the best person for the job, or the “only” person who can do it. Asking for help is sign of strength, not weakness.

Asking for help clears space for you and frees your time and energy. 37 Rebuild your thinking

Rebuild what it means to ask for help from “I am a weak, incompetent loser”

to “I am strategically allocating my time to focus on what matters most.” Don’

t focus on the fact that you can’t do something or don’ t have the time. 38 It’s

a chance to connect, a chance to value a colleague, a chance to get something done faster or better, a chance to optimize your own time and talents.

Asking for help is about tapping valuable resources to get the best outcome the most quickly with the fewest resources expended. That’s a fancy way of saying “get the right people for the job.” 40 And the best way to do that is to know your colleagues, and proactively build relationships.

A. Whatever the reason, we don’t ask for the help we need.

B. Think about your colleagues.

C. Your energy can’t be wasted.

D. Instead, think about what you will gain from the ask.

E. It’s all about building the right team.

F. It’s a smart strategy.

G. Know your colleagues.

第三部分英语知识运用（共两节，满分40分）

第一节（共20小题;每题1.5分，满分30分）

阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，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。

People I remember I was just eighteen when Grandma Julie died. Until the lawyer read her 41 , I would never fully 42 the depth of Grandma’s love. It was a moment I will never forget - a day that made me the 43 kid in town.

After 44 the distribution of Grandma’s legacies(遗产), the lawyer said, “There are three more things.” He 45 his briefcase and brought out a small 46 box, which contained my Grandma’s wedding ring. “These letters and notes are also for you,” he 47 .

Grandma’s letter began, “Dear Jeffrey, I’m 48 you one of my most precious treasures - my memories. These memories are the letters your 49 wrote me. They are both 50 and valuable - a(n) 51 that will teach you how to love and understand people, and how to respect and maintain your integrity(正直). When you read them you will 52 the love and passion of a good man for a good woman, and you’ll learn how love can become the 53 of your life.

“I have been 54 , since I loved a wonderful man who also loved me. Love

is like a beautiful 55 you store in an album. You can enjoy its beauty each time you stare at it 56 . I’ve just shown you how priceless his love notes are. Please learn from them. Then find the right girl to love and love her 57 . This love will 58 both your lives and make you both happier.”

“As for being valuable, save the envelopes. It’s said the old 59 are worth far more than the rest of my wealth. And, the personal hand-written note from General Pershing is even more valuable than the stamps. Have a 60 , meaningful life. God bless you.”

41．A．wish B．words C．decisions D．will

42．A．appreciate B．measures C．admire D．find

43．A．happiest B．luckiest C．richest D．loneliest

44．A．delivering B．sharing C．announcing D．writing

45．A．got into B．looked into C．searched into D．reached into

46．A．tool B．paper C．letter D．jewelry

47．A．added B．remarked C．whispered D．joked

48．A．buying B．leaving C．passing D．providing

49．A．Dad B．Mom C．Grandpa D．parents

50．A．priceless B．beneficial C．lovely D．serious

51．A．direction B．guidebook C．introduction D．approach

52．A．notice B．miss C．share D．feel

53．A．center B．edge C．process D．trouble

54．A．honest B．strong C．fortunate D．ambitious

55．A．photograph B．article C．memory D．record

56．A．at ease B．in wonder C．on purpose D．by chance

57．A．carefully B．immediately C．respectfully D．passionately

58．A．save B．strengthen C．enrich D．design

59．A．stamps B．notes C．letters D．envelops

60．A．satisfactory B．loving C．unforgettable D．successful

第二节（共10个小题，每小题1分，满分10分）

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Mandarin(普通话) Chinese is the most 61.__________(use) non-European language for children to learn, UK parents believe. It would boost(促进) their children’s career prospects (前景), according to 51% of parents, while 56% felt it would open their children's minds 62.__________an “exciting and dynamic culture”. Arabic and Japanese, 63. __________ were both picked by 14% of parents, were the other key non-European languages. The figures were gained after 1, 138 UK adults with children aged under eighteen 64.__________ (be) questioned in a survey 65.__________ (conduct) by the Mandarin Excellence Program (MEP). French, Spanish and German were the top choices overall for young people in the UK 66.__________ (learn) after being picked by 57%, 54% and 40% of parents respectively.

Mark Herbert of the British Council said: “With the global economy 67.__________ (become) more interconnected and the drive to boost exports, language skills are increasingly important for work and life. Mandarin Chinese is one of the 68.__________ (language) that matter most to the UK's future prosperity. If the UK is to remain competitive on the world stage, we need far more of our young people leaving school with a good grasp of Mandarin in order to 69.__________ (success) work abroad or for businesses here in the UK. Learning Mandarin is also a fascinating process that brings 70.__________valuable understanding of the Chinese culture.”

The MEP aims to help at least 5, 000 young people in England to speak fluent Mandarin Chinese by 2020.

第四部分短文改错（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。错误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（A )，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。

There is an old man live next to my door. He lives alone. Occasional his children will come to visit to him. When we asked him the reason for which he didn’t move to live with his children, he said he didn’t want to trouble them because their different lifestyles. The man likes to sit in front of the shop, that people chat excitedly every day. Once he helped the woman carry heavy food home. Besides, whenever someone ask for informations, he knows everything. He is surely a good person. And we were willing to look on her as our friend.

英语答案

听力 (共两节，满分30分)

1-5 ACBCC 6-10CABCC 11-15 BBCBC 16-20 ACACB

阅读理解（共两节，满分40分）

21-23 ACD 24-27 DBBA 28-31 CCAB 32-35 BCBA

36-40 AFDGE

第三部分完形填空（共20个小题，每小题1.5分，满分30分）

41-45 DACCD 46-50: DABCA 51-55: BDACA 56-60: BDCAB

第二节语法填空（共10个小题，每小题1分，满分10分）

61．useful 62．to 63．which 64．were 65．conducted

66．to learn 67．becoming 68．languages 69．successfully 70．a

短文改错 (共10小题，每小题1分，满分10分)

71．第一句:live→living

第三句:occasional→occasionally; 去掉第二个to 第四句:because后加of

第五句:that→where

第六句:the→a

第七句:ask→asks; informations→ information

第九句:were→are; her→him

安徽省合肥市蜀山区2018-2019学年七年级数学(上)期末试卷含答案解析

安徽省合肥市蜀山区2018-2019学年七年级数学（上）期末试卷含答案解析一．选择题（共10小题） 1．﹣8的相反数是（） A．﹣8 B．8 C．D． 2．下列计算正确的是（） A．5m+n＝5mn B．4m﹣m＝3 C．3n2+2n3＝5n5D．﹣m2n+2m2n＝m2n 3．举世瞩目的港珠澳大桥已建成通车，一桥连三地，天堑变通途，港珠澳大桥创多项世界之最，是中国从桥梁大国走向桥梁强国的里程碑之作，港珠澳大桥工程项目总投资额1269亿元，1269亿用科学记数法表示，正确的是（） A．1269×108B．1.269×108C．1.269×1011D．1269×1011 4．根据等式的基本性质，下列变形正确的是（） A．若a＝b，则a﹣c＝b﹣c B．若3x＝y，则6x＝3y C．若ax＝2，则x＝D．若x＝y．则 5．为了了解2018年某市七年级学生学业水平检测的数学成绩，从中随机抽取了800名学生的数学成绩，下列说法正确的是（） A．800名七年级学生是总体的一个样本 B．样本容量是800 C．2018年某市七年级学生是总体 D．每一名七年级学生是个体 6．已知关于y的方程﹣2y+a+7＝0的解是y＝2，则a的值是（） A．3 B．11 C．﹣3 D．﹣11 7．芳芳解方程组的解为，由于不小心两滴墨水遮住了两个数?和⊙，则?与⊙表示的数分别是（） A．B．C．D． 8．已知m、n两数在数轴上位置如图所示，将m、n、﹣m、﹣n用“＜”连接，其中正确的

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46、有点意思：有好赞！ 47、没时间：不得手！ 48、场面大：排场！ 49、脑子不清楚：拨弄 50、现在：张个 51、钥匙：约赤 52、勺子：唰子，挑子 53、簸箕：戳布 54、鼻涕：龙鼻 55、这里：料块 56、那里：啦块 57、一天的时间：天把 58、谁：哈个？ 59、什么：横个、轰个 60、傻，蠢，笨：孬头巴子、孬头巴鸡 61、够狠的意思：猪（野）头巴子 62、喜欢：泗洪斯烘 63、按不住：然不住 64、知道了：晓得了 65、没什么大不了的事：好大四、轰要经的？ 66、拖鞋：色鞋、撒鞋 67、不睬你：不优你

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2020届安徽省合肥一中高考数学模拟试卷一、选择题：本题共12小题，每小题5分，共60分。在每小题给出的四个选项中，只有一项是符合题目要求的。 1．在三棱锥中，和是有公共斜边的等腰直角三角形，若三棱锥的外接球的半径为2，球心为，且三棱锥的体积为，则直线与平面所成角的正弦值是（） A ． B ． C ． D ． 2．若函数()3 1f x x x =++，则()() 11lg2lg lg5lg 25f f f f ????+++= ? ????? （） A ．2 B ．4 C ．6 D ．8 3．设,a b r r 是非零向量，则“存在实数λ，使得λa b =r r ”是“a b a b +=+r r r r ”的 A ．充分而不必要条件 B ．必要而不充分条件 C ．充分必要条件 D ．既不充分也不必要条件 4．公元前5世纪，古希腊哲学家芝诺发表了著名的阿基里斯悖论：他提出让乌龟在阿基里斯前面1000米处开始，和阿基里斯赛跑，并且假定阿基里斯的速度是乌龟的10倍.当比赛开始后，若阿基里斯跑了1000米，此时乌龟便领先他100米；当阿基里斯跑完下一个100米时，乌龟仍然前于他10米.当阿基里斯跑完下一个10米时，乌龟仍然前于他1米……，所以，阿基里斯永远追不上乌龟.根据这样的规律，若阿基里斯和乌龟的距离恰好为210-米时，乌龟爬行的总距离为（） A ．410190- B ．5101900- C ．510990- D ．4109900- 5．执行如图所示的程序框图，则输出x 的值为( ) A ．2- B ．13 - C ．1 2 D ．3

6．已知()f x 是定义域为R 的奇函数，当0x >时，()ln f x x x =-．若函数()()g x f x a =+有2个不同的零点，则实数a 的取值范围是（） A ．[]1,1- B ．()1,1- C ． (][),11,-∞-+∞U D ． ()(),11,-∞-+∞U 7．已知函数()(12),1 1 log ,1 3x a a x f x x x ?-≤? =?+>??，当12x x ≠时，()()12120f x f x x x -<-，则a 的取值范围是( ) A ．10,3?? ?? ? B ．11,32?????? C ．10,2?? ??? D ．11,43?? ???? 8．以下说法错误的是（） A ．命题“若2320x x -+=，则1x =”的逆否命题为“若1x ≠，则2320x x -+≠” B ．“2x =”是“2320x x -+=”的充分不必要条件 C ．若命题:P 存在0x R ∈，使得2 0010x x -+<，则p ?:对任意x R ∈，都有210x x -+≥ D ．若p 且q 为假命题，则,p q 均为假命题 9．已知()f x 是定义在R 上的奇函数,且(1)f x +为偶函数,若(1)2f -=,则(1)(2)(3)(2019)f f f f ++++=L （） A ．4 B ．2 C ．0 D ．-2 10．5 12a x x x x ????+- ???? ???的展开式中各项系数的和为2，则该展开式中常数项为 A ．-40 B ．-20 C ．20 D ．40 11．关于圆周率π，数学发展史上出现过许多有创意的求法，最著名的属普丰实验和查理实验，受其启发，我们可以设计一个算法框图来估计π的值（如图），若电脑输出的j 的值为29，那么可以估计π的值约为（）

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