周练15
高一英语周练15
●第一节单项填空
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. —Would you like to go to the picnic this weekend? —Thank you, but _______
A. why not?
B. I’d rather not.
C. have fun.
D. I don’t agree.
2. Wild animals have been overhunted, and as _________ result, some of them are among
the animals in ______ danger.
A. a; the
B. a; 不填
C. the; a
D. 不填; the
3. —Is ______ ready for the trip, Gary? —No, we still have much to do.
A. anything
B. something
C. nothing
D. everything
4. When the doctor said I was getting better after the operation, my parents smiled _____.
A. in charge
B. in turn
C. in return
D. in relief
5. He _______ dislike Chinese food, but recently it seems that he has ________ it.
A. is used to; got used to
B. used to; got used to
C. used to; used to
D. is used to; used to
6. Tom succeeded _______ a movie star, though he failed ______ a doctor’s degree (博士学位).
A. in becoming; in getting
B. to become; to get
C. in becoming; to get
D. to become; in getting
7. Do you know what have ______ him ______ answering my call?
A. kept; from
B. led; to
C. protected; from
D. turned; to
8. —It’s so hot. I want to have a shower.
—I’m afraid you have to wait for a while. The bathroom ______ at the moment.
A. is used
B. is being used
C. has been used
D. has been using
9. You can drink a little alcohol once in a while. There is no ______ in doing so.
A. good
B. need
C. use
D. harm
10. The medicine had a good __________ on her; she has recovered after taking it.
A. help
B. effect
C. cause
D. result
11. From then on, whenever Robert finished his supper, he ______ begin to read.
A. used to
B. should
C. would
D. had to
12. He ______ examined twice by the doctor and no signs of lung cancer are found.
A. has been
B. is being
C. was
D. is
13. I’ll never forget the time ____ I was a student of Professor Zhang, and _____ has influenced me greatly.
A. that; which
B. which; that
C. when; that
D. which; which
14. Our computer is out of order and it ______ in the place where we bought it.
A. is repairing
B. was repaired
C. is being repaired
D. was being repaired
15. I’d really appreciate ______ if you could help me move this piece of furniture into my room.
A. that
B. it
C. you
D. /
16. This article ________ a brief introduction to the history of Chinese poetry.
A. contains
B. uses
C. holds
D. owns
17. His business is going very well, with ______ 600 pairs of shoes being sold every day.
A. many
B. much
C. some
D. any
18. ______ the thought of her dead dog, Kate couldn’t keep her tears back.
A. Of
B. On
C. For
D. At
19. He finally could afford to buy the camera he had ____ for.
A. hoped
B. longed
C. counted
D. expected
20. —My mum just called me back home so I think I’d better leave now.—______
A. See you.
B. Take it easy.
C. Stay longer.
D. Go slowly.
●第二节完形填空
阅读下面短文，从短文后各题的A、B、C、D四个选项中，选出适合填入对应空白处的最佳选项。Christmas is coming. Erika Orlando begins writing a Christmas 21 . Outside the house 22 is falling. Soft flakes (雪花) have covered the world. Her 23 goes back to a summer day and a beach as bright as snow.
On a family 24 in Santa Rosa, Florida, Erika and her brother were sitting on the 25 white sand, enjoying the sunshine. Children were 26 on the beach. Just then, they heard a woman 27 , “Rob is missing!” The woman’s husband 28 toward the ocean to 29 his son. Erika asked the father to 30 her what the child looked like. He said, “He has 31 hair and wears a bright orange shirt. He is afraid of the water.”
Erika’s mind was already working 32 . Orange shirt, afraid of water. At once she had an image (印像) of a
33 in the sand. It was just a few feet away from where the boy’s mother34 .
Erika went over at once, 35 on her knees and started digging. A foot down, her fingers touched something different, 36 and fine, his dark hair. She called out, “I think I have found him!”
37 , he’d fallen into the ho le other kids had dug, and the 38 fell in, completely covering him. The crowd dug out enough 39 so that Rob’s father was able to lift him out.
Snow 40 to fall outside. Erika looks down at the Christmas card and begins to write, “Dear Rob, ...”
21. A. letter B. card C. article D. song
22. A. snow B. rain C. leaf D. dust
23. A. idea B. speech C. dream D. mind
24. A. party B. dinner C. holiday D. meeting
25. A. warm B. dirty C. wet D. cool
26. A. studying B. playing C. swimming D. sleeping
27. A. singing B. saying C. appearing D. crying
28. A. climbed B. changed C. ran D. jumped
29. A. look for B. talk about C. take away D. look up
30. A. question B. tell C. give D. write
31. A. short B. blonde C. long D. dark
32. A. powerfully B. badly C. quickly D. slowly
33. A. hole B. box C. child D. shirt
34. A. missed B. stood C. hid D. worked
35. A. turned B. put C. sat D. fell
36. A. soft B. hard C. straight D. thick
37. A. Nearly B. Clearly C. Fortunately D. Immediately
38. A. tops B. sides C. bottom D. body
39. A. hair B. flakes C. space D. water
40. A. happens B. stops C. begins D. continues
第三部分阅读理解
阅读下列短文，从每小题后所给的A、B、C、D四个选项中，选出最佳选项。
A
I was born in the United States. We were a Thai family growing up in America. Years ago, my mother told me about a Thai man who married an American woman against the wishes of his mother. The mother refused to speak to her son because he had married a girl that was not Thai. Not believing this story, I asked my mother, “Really? You would never do that to me, would you?” “No,” she answered, “but I wouldn’t speak to you for 10 years!” I laughed at her joke.
Well, I didn’t marry a Thai man or an American man. I married a Frenchman. By the time I finally got married, my mother was so happy at the fact that I was even getting married. It probably wo uldn’t have even mattered if I was marrying someone from outer space.
Now I have come to appreciate the Thai part of my character as well as the American one. My husband has lived in the United States, which is a great melting pot of different cultures, for the last 25 years. He grew up in France but chose to live in America. After we decided to get married, we decided to do something to deal with our differences on both sides. Now our hearts belong to each other, not to our respective (各自的) cultures.
41. The author’s parents are from _______.
A. the USA
B. France
C. England
D. Thailand
42. How did the author’s mother feel when the author got married?
A. Happy.
B. Sad.
C. Disappointed.
D. Nervous.
43. Which of the following is right about the love between the new couple?
A. Her husband moved to America because of their love.
B. It made her family unhappy.
C. It made her mother stop speaking to her for 10 years.
D. It made their cultural differences less important.
B
Many years ago a kind farmer bought a tank (桶) of gas for a mom with two children. He didn’t accept any money but just smiled and said, “Pass it on to someone else.”The mom was my mother. After many years, I had a similar experience.
A few weeks ago as my husband and I were filling up our car with a coupon (优惠券) for 99 cents a gallon, I got into a long line to pay. I could see that the young man before me was having some kind of problem, and I quickly realized that he had misunderstood the coupon and thought it was 99 cents to fill his small truck.
Everyone was saying, “99 cents a gallon is so cheap —they can’t give the gas away.”He was embarrassed and was just calling his wife when I got to the counter (柜台). He said to his wife, “Just come here because I don’t have enough money on me.”I asked the cashier (收银员) how much his gas was, and she told me.
I said I would pay for it and touched the man’s shoulder and told him to tell his wife it had been paid for. He nodded and turned back to the phone, then stopped and looked at me. “What?” I told him again, and I was so surprised to see everyone stop what they were doing to watch me as if I had just grown another head. When he asked how he could give the money back to me, I just said, “Pass it on to someone else in need!”
44. Why did the author help the young man pay for the gas?
A. She had learned something from the farmer.
B. She disliked waiting for a long time.
C. She had a lot of money on her.
D. Her husband told her to do so.
45. We know from the passage that the young man ______.
A. paid for his gas with the help of his wife
B. felt stupid for having mistaken the gas price
C. went to the gas station together with his wife
D. was not allowed to use the coupon that day
46. Why did other people stare at the author when she paid for the young man’s gas?
A. They were embarrassed.
B. The author was foolish.
C. They didn’t believe it.
D. The author looked strange.
47. Which of the following is the best title for the passage?
A. A Kind Farmer
B. A Tank of Gas
C. Help for a Young Man
D. A Mistake About a Coupon
C
You can get a lot from being healthy. Everyone needs to take time to exercise. There are lots of ways to improve your health without having to join a gym. Here are some tips on how to make better use of your free time while staying healthy.
By keeping physically active, you’re making sure that your joints (关节) and body organs (器官) are kept in good working order. Exercise can also help keep your weight at a healthy level and can protect you against catching coughs and colds. Other benefits are increases in your energy level and brain activity. Knowing that you’re looking and feeling good can also increase your self-confidence.
If you’re under 18, you should try to do a total of 60 minutes of physical exercise every day. This includes anything f rom taking the lift at the gym to walking up stairs. If you’re over 18, you need at least 30 minutes of exercise at least five days a week.
Getting fit isn’t all about gyms —some forms of exercise won’t cost you any money, and most forms can be easily used in your busy life without having to find some special time in your day. For example, riding a bike to school, college or work, and even running on a playground a few times a week can improve your fitness level.
Getting fit isn’t just something you have to do by yourself. Playing team sports like football or basketball is great exercise, and it is often more enjoyable because you’re playing with a group of friends.
48. How much exercise does Mr. Wang, a supermarket manager, need every week?
A. At least 30 minutes every day.
B. At least 30 minutes five times a week.
C. At least 60 minutes five times a week.
D. At least 60 minutes every day.
49. You can have more fun and keep healthy at the same time by _________.
A. taking the lift at the gym
B. running on the playground
C. riding a bike to school
D. playing football
50. What can we learn from the passage?
A. Walking up stairs is also a kind of exercise.
B. It is no use exercising by yourself.
C. Don’t do exercise if you are busy.
D. One should try to save money for joining a gym.
第四部分短文改错(共10小题；每小题1分，满分10分)
Two months before, I came to America to learn cooking. When I got this school, everything seemed strange to us. You know, I can only speak very few English. At first, I couldn’t follow the teachers in class, and I were very nervous. Lucky, all the teachers and my classmates were very kind and friendly. They helped me at my life and my studies. Soon, I joined in their group and got used to live here. Now, I am glad to say that everything is going the better and better.
●第二节书面表达(满分15分)
在学过“Wildlife Protection”这一单元后，你班同学进行了一次role-play（角色扮演）的活动：大家轮流扮演一种珍稀动物来介绍自己，以唤起大家对野生动物的保护意识。假设你是其中一名表演者，你会选择什么动物，又会怎样向大家介绍自己呢？请用英文写一篇110词左右的短文，将“自我介绍”以书面形式呈现给大家。
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阅读附加题（共5小题；每小题2分，满分10分）
A group that rescues wildlife has started to search for land and money to build a wildlife hospital in San Francisco.
“About 40 volunteers care for injured animals in their homes,”the founder Jamie Ray said. Ray presented her proposal (提议) to build a $2 million wildlife hospital and nature center to environment commissioners (专员) recently. “What we need is to be able to build a 100-foot-long flight aviary (鸟舍) for recovering birds and to have water pools for recovering water birds,”Ray said.
She hopes they will open by the end of 2010, and will be able to care for oiled birds after more than 50,000 gallons of fuel flowed into the Bay.
“For any animal, whether it is oiled, injured or anything else, getting it immediate care is important to its survival,” she said.
Department employees drive as many as 350 injured animals every year to a wildlife hospital, according to Friedman. He said around 80 percent of those animals were birds. “It would be wonderful to have a wildlife rehabilitation center (康复中心) here in San Fr ancisco,” Friedman said.
Ray’s proposal includes aviaries as well as a nature education center and outdoor picnic area. She has suggested building the center at Lake Merced or in western Golden Gate Park. A parking lot, soccer field and storage area are presently being planned for construction at the Golden Gate Park site. Any change to those plans would need to be approved by department commissioners. The Board of Supervisors is also in charge of those plans.
1. What do we know about oiled birds?
A. They are being cared for by volunteers.
B. They are probably water birds.
C. They are called oiled birds because they can produce oil.
D. They are birds usually seen in San Francisco.
2. What may NOT be included in Ray’s proposal?
A. A nature education center.
B. An aviary.
C. An outdoor picnic area.
D. A soccer field.
3. The underlined word “approved” in the last paragraph can be replaced by “______”.
A. agreed
B. advised
C. advertised
D. affected
4. We are told in the passage that _________.
A. there are already some wildlife rehabilitation centers in San Francisco
B. the wildlife hospital in San Francisco will be built in 2010
C. it is important for injured animals to get timely care
D. there are about 40 volunteers working in the wildlife hospital
5. It can be inferred that _________.
A. Ray wants to build a 100-foot-long aviary
B. about 350 birds are injured every year in San Francisco
C. birds are most easily injured animals in San Francisco
D. Ray is in charge of the Board of Supervisors
参考答案
1-5 BCCAB 6-10 ACCAC 11-15 BCAAC 16-20 CCBAC
21-25 CABDB 26-30 CACCB 31-35 ACDBA 36-40 BADCA
41-45 BDCAB 46-50 DCABD
51-55 ABBCD 56-60 DADAB
61-65 CBBDA
66. before→ago 67. got后加to
68. √69. few→little
70. were→was 71. Lucky→Luckily
72. at→with
73. 去掉in
74. live→living 75. 去掉the
书面表达(One possible version)
I am a panda from Wolong, Sichuan Province. I live on bamboo. I am a good friend to humans and have helped them a lot in some meaningful ways. For example, some of my fellows have been sent to other countries to help increase friendship between peoples.
Unfortunately, however, the number of pandas has greatly decreased over the years for all kinds of reasons, such as climate change, shortage of bamboo, hunting, etc. Now, only about 1,500 pandas are left in the world. That is to say, we are endangered animals.
Although a lot of measures have been taken to protect us, which I really appreciate, there are a few people who are still doing harmful things to us. So I hope that what I say here can help raise the awareness of those people to protect us from extinction.
阅读附加题
1-5 BDACC
听力原文
Text 1
W: The machine is making a strange noise. Would you mind checking it?
M: I don’t know anything about machines, but I will call Mr. Lee to help. He is an expert, you know.
Text 2
M: The game will soon begin.
W: I can’t wait to watch the game. This is the first time that I’ve ever been to a football game here. I always watch football on TV at home.
Text 3
W: Do you want to go to Thomas’ birthday party?
M: Ye s, but what about the kids? Can we leave them at your mother’s house?
W: No, she’ll be busy on Friday night. But our neighbor said she would help us.
Text 4
W: What can I do for you, sir?
M: I left my briefcase in your restaurant about ten minutes ago.
W: What does your briefcase look like?
M: It’s a new brown leather case. I bought it just 2 days ago.
Text 5
M: Would you recommend some places to visit in Beijing?
W: Sure. The Great Wall and the Summer Palace are popular, but I think the Palace Museum is always my first choice.
Text 6
M: What are you reading?
W: It’s a novel. It’s not very good, but it’s probably the best way to pass the time now.
M: I can’t read on a train even though I really like to read. I can’t concentrate.
W: So what kinds of books do you enjoy?
M: I like non-fiction the most, especially books about travel and science.
W: I like fiction as well as non-fiction. There is a good library near where I live.
M: That’s great. I’m studying twentieth century history at the moment.
W: I am studying to be a doctor. What do you major in?
M: History and philosophy, but I like to read popular books about science, especially astronomy.
Text 7
M: Mom, tomorrow is my birthday. How shall we celebrate it?
W: First of all, we’ll get you a birthday pres ent. Do you want an MP4 player, or a camera?
M: Neither. My bike is broken. Can I get a new one?
W: Of course. And there will be a birthday cake too, with twelve candles. Shall we have a special dinner? M: Yes, of course. How about Chinese food?
W: Fine. Where do you want to have it? We can go to a restaurant.
M: Why not have it at home? Dad is good at cooking Chinese food. Let’s invite grandma to join us.
W: OK. Are you going to do the shopping with me as well?
M: With pleasure. When?
W: This afternoon once we are free.
Text 8
M: Ladies and gentlemen, let’s welcome Jane, a Japanese student studying in Britain. Hello, Jane. How long have you been studying in Britain?
W: About three years.
M: So, what differences do you notice between the two countries?
W: Well, the biggest difference is the people. They are not as open-minded as Americans, rather cold really. But once you have made a friend, it’s a friend for life. But it usually takes some time.
M: What about their way of life?
W: Well, it’s certainly more relaxed here. In Japan people work a lot harder than you do. Our work always comes first. It’s the speed of life that I find rather tiring.
M: What do you think of English food?
W: It’s healthy. But I wouldn’t like to have it every day. It’s rather —I wouldn’t say dull — but has less flavor. You know in Japan we like sushi; English people eat fish and chips and it’s not quite the same.
M: What about the weather?
W: It’s changeable. I prefer the summer here to the winter. Anyway, I like this country.
Text 9
W: I really don’t know what to do this summer. I want to get a job to gain some work experience.
M: Why don’t you try house-sitting? Last summer my friend Mary house-sat for the Greens when they went away on vacation. Mrs. Green hired Mary to stay i n their house, because they didn’t want their house left empty.
W: You mean the Greens paid Mary just to live in their house?
M: It wasn’t that easy. She had to take care of their pets and water the house plants.
W: That sounds like a good job. It’s a litt le like baby-sitting — but you are taking care of houses instead of children.
M: Before you get this kind of job, you must have an interview with the homeowner.
W: That seems like a lot of trouble.
M: You know, the homeowners want to make sure you are not the type who will hold wild parties in their houses, or move a group of friends in with you.
Text 10
Panda is a small horse about 60 cm tall. She is a “guide horse” for the blind. The two-year-old was taught by her trainers to help blind people in the same way as guide dogs. She stops when she crosses busy roads or when the roads are not good. She can get in and out of a car, go up and down stairs and is completely house trained. And as a guide animal, Panda is allowed to go with her owner Ann Edie in shopping centers, supermarkets and even on planes.
Panda is one of the only two small horses in the world that have been trained for the job. Her American trainers at The Guide Horse Foundation say that small horses often make better guides than dogs.
Some blind people grow up with the animals and some want a companion that will live longer than a dog. This kind of guide horse is specially trained for these people. Mrs. Edie has been blind since birth. She said, “Panda could live for 30 years. She’s become li ke a dance partner. She moves with me and can understand
what I mean and feel.”
高三数学周周练(含答案)
高三数学周周练 2018．9 一、填空题（本大题共14小题，每小题5分，共计70分．不需要写出解答过程，请将答案填写在答题卡相应的位置上．．．．．．．．． ．） 1．设集合A ＝{﹣1，0，1}，B ＝{0，1，2，3}，则A I B ＝ ． 2．若复数12mi z i -=+（i 为虚数单位）的模等于1，则正数m 的值为 ． 3．命题“(0x ?∈， )2π，sin x ＜1”的否定是 命题（填“真”或“假”）． 4．已知1sin 4α=，(2 πα∈，)π，则tan α= ． 5．函数()sin(2)sin(2)33f x x x ππ =-++的最小正周期为 ． 6．函数2()log f x x =在点A （2，1）处切线的斜率为 ． 7．将函数sin(2)6y x π =+的图像向右平移?（02π ?<<）个单位后，得到函数()f x 的 图像，若函数()f x 是偶函数，则?的值等于 ． 8．设函数240()30 x x f x x x ?->=?--，则实数a 的取值范围是 ． 9．已知函数2()f x x =，()lg g x x =，若有()()f a g b =，则b 的取值范围是 ． 10．已知函数322()7f x x ax bx a a =++--在1x =处取得极小值10，则b a 的值为 ． 11．已知函数()sin ([0f x x x =∈，])π和函数1()tan 2 g x x = 的图像交于A ，B ，C 三点，则△ABC 的面积为 ． 12．已知210()ln 0 x x f x x x +≤??=?>??，，，则方程[()]3f f x =的根的个数是 ． 13．在△ABC 中，若tanA ＝2tanB ，2213a b c -= ，则c ＝ ． 14．设函数2()x a f x e e =-，若()f x 在区间(﹣1，3﹣a )内的图像上存在两点，在这两点处的切线相互垂直，则实数a 的取值范围是 ． 二、解答题（本大题共6小题，共计90分．请在答题纸指定区域．．．．．．． 内作答，解答应写出文字说明，证明过程或演算步骤．）
周练生物试题
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五年级数学下册周周练及答案全册 数 学 学校 年级 姓名 主编：苏富华李秀英 副主编： 编委成员：苏富华李秀英
第一周 得分： 一、填一填.（26分） 1、 如果一个图形沿着一条直线对折，两侧的图形能够完全重合，这样的图形就叫（ ）图形，那条直线就是（ ）. 2、 正方形有（ ）条对称轴. 3、 这些现象哪些是“平移”现象，哪些是“旋转”现象： （1）张叔叔在笔直的公路上开车，方向盘的运动是（ ）现象. （2）升国旗时，国旗的升降运动是（ ）现象. （3）妈妈用拖布擦地，是（ ）现象. （4）自行车的车轮转了一圈又一圈是（ ）现象. 4、移一移，说一说. 1）向（ ）平移了（ ）格. 2）向（ ）平移了（ ）格. 3）向（ ）平移了（ ）格. 1、 ① ②③ 图形①是以点（ ）为中心旋转的；图形②是以点（ ）为中心旋转的；图形③是以点（ ）为中心旋转的. 2、 （1）图形1绕A 点（ ）旋转90. 到图形2. （2）图形2绕A 点（ ）旋转90. 到图形3. （ 3）图形4绕A 点顺时针旋转（ ）到图形2. （4）图形3绕A 点顺时针旋转（ ）到图形1. 三、画出下列图形的对称轴.（12分）
四、请画出对称图形的另一半.（15分） 分） 六、画出下图经过平移或旋转的图形.（9分） 第二周 得分： 一、填空.（每空1分，共40分.） 1、在3×9=27中，（）是（）和（）的倍数.在18÷3=6中，（）和（）是（）的因数.5×7=35中，（）是（）和（）的倍数，（）和（）是（）的因数. 2、18的因数有（）. 11的因数有（）. 39的因数是（）.从上面可以看出，一个数的因数的个数是有限的，其中最小的因数是（），最大的因数是（）. 3、在8和48中，（）是（）的倍数，（）是（）的因数. 4、分别写出下列各数的倍数. 3的倍数；8的倍数. 从上面可以看出，一个数的倍数的个数是（）的，其中最小的倍数是（），没有（）. 5、18最大的因数是（），最小的倍数是（）.一个数的最大因数是12，这个数是（）；一个数的最小倍数是18，这个数是（）.一个数最大因数是12，这个数的最小倍数是（）.一个数既是15的因数，又是15的倍数，这个数是（）. 6、7是7的（）数，也是7的（）数. 7、在15、18、25、30、19中，2的倍数有（），5的倍数有（），3的倍数有（），既是2、5又是3的倍数有（）. 8．在17、18、15、20和30五个数中，偶数是（）；3 的倍数是（）.
高三生物周练十六
高三生物周练十六 项最符合题目要求。 1. 下列各组物质中基本组成单位相同的是（ ） A. 载体和抗体 B. DNA 和RNA C. 纤 维素和性激素 D. 糖原和抗原 2. 生物膜是生物学研究的一个重要领域。下列叙述不科学的是 A. 线粒体膜和叶绿体膜中的蛋白质种类和数量是不同的 B. 生物膜的研究已深入到分子水平，现已研制出了多种人造生物膜 C. 细胞内的生物膜保证了细胞生命活动高效、有序地进行 D. 兴奋在神经纤维上的传导，其本质是膜的流动性 3. 引发艾滋病、肺结核、疟疾 3种传染病的病原体都 （ ） A. 属于人的抗原 B ?属于原核生物 C ?具有细胞结构 D ?属于分解者 4. 抗流感的疫苗，每过几年就要更换新的种类，因为流感病毒已对旧的疫苗产生了高度的抗性，这 种抗性最好的解释是 A. 病毒的获得性遗传 B ?病毒某些结构的用进废退 C.由于生殖隔离造成 D .由于选择作用，使对疫苗有抗性的病毒被保留下来扩大繁殖 6. 二、双项选择题：本题共 2个小题，每小题 6分，共12分。每小题给出的四个选项中，有二个选 项符合题意。每小题全选对得 6分，选对1项且正确得3分，错选、不选得 0分. 24. 下列有关科学实验与方法的叙述正确的是 A. 利用光学显微镜观察细胞膜磷脂双分子层 B. 用35S 标记噬菌体的 DNA 并以此侵染细菌，证明了 DNA 是遗传物质 C. 沃森和克里克研究 DNA 分子结构时，运用了建构物理模型的方法 D. 孟德尔采用假说-演绎法发现了遗传规律，摩尔根采用假说 25. 右图为某个用15N 标记的DNA 分子结构示意图，该 DNA 含有 100个碱基对，其中有胞嘧啶60个，该DNA 分子在14 N 的培养基 中连续复制4次。相关叙述，正确的是 A. 复制过程中需腺嘌呤脱氧核苷酸 600个 B. 该DNA 的特异性表现在碱基互补配对原则上 5. 下图表示生态系统中碳循环的部分过程，其中 无机环境中的CO2 - ③ A 、 B C D 组成生物群落。下列说法正确的是 A. A 是生产者，D 是分解者 B. 图中箭头可以表示碳元素的流动方向 C. ①②③过程中伴随着能量的传递 D. 无机环境中的 CO 都是生物细胞呼吸的产物 -演绎法证实了基因在染色体上 15 N ① ② 15 N
9月20日生物周练卷及答案
2014-2015学年度安阳县实验中学生物周练卷 第I卷（选择题） 一、选择题（每空2分） 1．下列有关种群特征的说法不正确的是( ) A．种群密度是最基本的数量特征 B．出生率和死亡率与年龄结构有关 C．性别比例对种群密度有一定影响 D．出生率、死亡率是决定种群数量变化的唯一因素 2．为了保护鱼类资源不受破坏，并能持续地获得最大捕鱼量，根据种群增长的“S”型曲线，应使鱼群种群数量达到K/2水平再捕劳，这是因为在这个水平上 A.种群密度最大 B.环境所能允许的种群数量最大 C.种群数量相对稳定 D.种群增长速率最大 3．以下三图分别表示两个生物种群随时间推移而发生的数量变化。那么甲、乙、丙三图表示的关系依次是（） A．竞争、捕食、互利共生 B．捕食、竞争、互利共生 C．竞争、互利共生、捕食 D．互利共生、捕食、竞争 4．利用标志重捕法调查某丘陵地区4 km2区域中刺猬的种群密度，第一次捕获并标记50只刺猬，第二次捕获40只刺猬，其中有标记的5只。下列叙述错误的是( ) A．标记个体与未标记个体被捕获的概率基本相同 B．迁入率和迁出率影响该种群数量变化 C．标记符号过分醒目可能增加刺猬被捕食的概率 D．该种群的密度大约是400只/km2 5．右图是某种兔迁入新环境后种群增长速率随时间的变化曲线。第3年时用标志重捕法调查该兔种群的密度，第一次捕获60只，全部标志后释放，一个月后进行第二次捕捉，在第二次捕获中，未标志的80只、标志的30只。估算该兔种群在这一环境中的K 值是（） A．110只 B．220只 C．330只D．440只 6．下列调查活动或实验中，所得到数值与实际数值相比较，可能偏小的是 A．用标志重捕法调查池塘中鲤鱼的种群密度时，部分鲤鱼身上的标志物脱落 B．调查土壤小动物丰富度时，用诱虫器采集小动物时没有打开装置上的电灯 C．调查草地中的蒲公英的种群密度时，样方线上的个体都被统计在内 D．在调查抗维生素D佝偻病的发病率时，以多个患者家系为调查对象 7．下图是调查小组同学从当地主管部门获得的某物种种群数量的变化图，据此图分析，正确的是（）