发布时间 : 星期一 文章2020高考英语新创新大一轮复习人教全国版精练选修8Unit2课下作业（一 - 三）含答案更新完毕开始阅读
选修8 Unit 2 课下作业（一~三）
课下作业（一） 考点过关针对练
Ⅰ.单词拼写
1．With medical breakthrough (突破), people are living a healthier and longer life. 2．As is well known to all, there are altogether (总共) seven continents in the world. 3．Our school is a non-smoking school.So smoking is forbidden (禁止) here. 4．Economists are working on the assumption (假设) of an interest rate cut.
5．I think our offer is reasonable (合情理的) and realistic and you shouldn't turn it down. 6．This question is quite straightforward (直接的), while that one is much more complicated. 7．But just as a coin has two sides, Internet has its own drawbacks (缺点) which should not be neglected.
8．She is overweight, but she can't resist (抵制；抵抗) eating more delicious food.
9．They may know the rules correctly, but they are unable (不能的) to use them to work out practical problems.
10．Babies can sense whether an adult is happy or not merely (仅仅) on the basis of clues such as the rate, volume, and melody of adult speech.
Ⅱ.语境语法填空
1．Robert, ?differing (differ) from most of the elderly, doesn't enjoy his old age in peace after retiring ?from work. Instead, he felt his health was ?in good condition and now he ?is_undertaking (undertake) the duty of helping maintain the order of his community. Accidents used to occur here frequently, which made people feel cast ?down. Several kids ?were_struck (strike) by private cars and this situation ?bothered (bother) most of the residents. Robert couldn't resist ?joining (join) in his community volunteer service. They took steps ?to_forbid (forbid) drunken drivers from driving in and out. Their efforts finally paid?off.Since then, no
11owing (owe) to efforts of volunteers like Robert and he○12 accident has ever happened again，○
has_obtained (obtain) the respect of all community residents.
2．It's common that people hold ?different (differ) views on the same issue. To get the work done, it is important to raise ?objections (object) frankly rather than set aside the differences. Nothing could be better than putting forward a more ?reasonable (reason) solution. Ⅲ.语境改错
文中共有10处错误，每句中最多有两处，请找出并改正。
People differs greatly in cloning technique.Some people are in the favour of its development, for they believe it will bound to benefit us.One advantage of cloning is what people who suffer from a certain rare disease can be cured in the future.Others feel casting down.They think it is not
moral reasonable and should be forbade.As far as I'm concerned, cloning is a new breakthroughs and it will pay for.But we must promise to use them properly.
答案：第一句：differs→differ 第二句：去掉the; bound前加be 第三句：what→that 第四句：casting→cast
第五句：moral→morally; forbade→forbidden 第六句：breakthroughs→breakthrough; for→off 第七句：them→it Ⅳ.根据提示补全句子
1．他们反对坐公共汽车去那儿，因为它会花费很长时间。(object) They objected_to_going_there_by_bus because it would take a long time. 2．最让他沮丧的是没人费心告诉他更改了的时间表。(bother)
What upset him most was that nobody had_bothered_to_tell_him about the changed timetable. 3．我突然想起家中没有人。(strike) It_struck_me_that there was no one at home. 4．当她最终获得奥运金牌的时候，那位运动员多年的艰苦训练得到了回报。(pay off) The_athlete's_years_of_hard_training_paid_off when she finally won the Olympic gold medal. 5．抄袭他人的作业的一个缺点就是你不能掌握你所学到的东西。(that引导的表语从句) A disadvantage of copying others' homework is that_you_can_not_master_what you_have_learned.
课下作业（二） 话题阅读培优练
Ⅰ.根据提示填空
Be Careful about Cloning
After a series of initial experiments and corrections, the scientist's hard work ?paid_off (得到好结果) when the twin clone turkeys were hatched with normal feather and claws.This breakthrough possibly enabled people to bring their adored pets back to life.However, it bothered him from time to time that their health was in poor condition because they were unable ?to_resist (resist) illnesses.This drawback cast him down.?Merely (mere) 2 weeks later, the clones and their carrier died, which struck frustration into his heart.He retired before he attained his ambition and became a member of an opera chorus to relieve his depression.
Shortly afterwards, the media published a conservative ?argument (argue) objecting to cloning owing to moral problems, and suggested the constitution include compulsory regulations to forbid ?obtaining (obtain) commercial profits from cloning. When interviewed, the scientist stared at the decorations on the ceiling, thinking for a while,
and then said, “I'm not in favour of any arbitrary ?assumption (assume), but undertaking cloning does differ from the straightforward procedure of making loafs out of flour.Until we accumulate enough exact knowledge, any practice is in vain and is bound ?to_fail (fail)．Altogether, being more careful is ?reasonable (reason) or we may walk into a side road.”
Ⅱ.片段选词填空
cloning， unique， become a reality， be proud of， cloned mother， communicate with， as far as I'm concerned， be beneficial to， bring about， respect life The following are the opinions of some middle school students about ?cloning. Li Meng: I hope that scientists can use cloning to produce children as soon as possible. My aunt lost her husband two years ago. She loves him so much that she is determined not to marry again. But she wants to have a child. So all my family hope human cloning will ?become_a_reality soon, and then I will have a cousin to play with!
Zheng Lijun: Why do people want to clone human beings? I won't clone myself, even if it is possible. I am ?unique in the world and I ?am_proud_of that. If another Zheng Lijun appeared, there would not be any need for me to exist.
Yang Qing: I wish I could have a ?cloned_mother as soon as possible. Since I am very naughty at school, my mother is often asked to visit the teacher. She never blames me after ?communicating_with my teacher, but she is sad for a few days. So I want to clone another mother to meet the teacher instead of my current mother!
?As_far_as_I'm_concerned,_while cloning ?is_beneficial_to the world in many aspects, I don't think that cloning human beings is acceptable. It may ?bring_about many unexpected problems. We should ?respect_life and let everything stay as it is.
课下作业（三） 高考语篇提能练
Ⅰ.阅读理解
A
(2019·陕西质检一)It's easy to keep your aging brain as quick as it was in college. Use a website full of brain games or download the right apps, and within 20 minutes you'll be doing your part to sharpen your memory and slow the decline of your mental functions. At least that's what the companies behind this booming industry would have you believe. But is it true?
Concrete proof about the benefits of brain games is hard to come by, experts say, when it comes to measurably improving aspects of mental fitness, like having a good memory. “People would really love to believe they could do something like this and make their brain better, but there's just no solid evidence，” says Randall W. Engle, a primary investigator at the Attention & Working Memory Lab at the Georgia Institute of Technology.
That's not to say brain games are without benefits. Experts say these kinds of mental exercises
can change your brain. The brain changes with just about everything you do, including mental training exercises. But numerous studies have shown that brain games lack what researchers call “transfer”. In other words, repeating a game over and over again teaches you how to play the game and get better at it but your brain aging won't necessarily come to a stop.
“It's like, you walk through fresh snow, and you leave a trace. If you walk the same route again, the trace gets deeper and deeper，” says Ursula Staudinger, director of the Butler Columbia Aging Center at Columbia University. The fact that structural changes occur does not imply that in general this brain has become more capable. It has become more capable of doing exactly the tasks it was practicing.
语篇解读：本文是一篇科普说明文。据说脑力游戏可以提高记忆力和延缓大脑功能的衰退，但是研究表明，脑力游戏仅能提高玩家对游戏技巧的掌握，并不能真正阻止大脑的老化；其作用还有待证明。
1．We can infer from the first paragraph that ________. A．brain games improve the memory B．brain aging actually can be quitted C．people don't believe brain games
D．the author doubts the effect of brain games
解析：选D 推理判断题。根据第一段最后两句“At least that's what the companies behind this booming industry would have you believe. But is it true？”可知，这个蓬勃发展的行业背后的公司会让人相信脑力游戏可以提高记忆力和延缓大脑功能的衰退，但作者对其真实性表示怀疑，故D项正确。
2．What does Engle think of the functions of brain games? A．They really make some difference. B．Their effects still need proving. C．People like to be led by the nose. D．People don't believe the effects.
解析：选B 细节理解题。根据第二段第二句“People would really love to believe they could do something like this and make their brain better, but there's just no solid evidence”可知，Randall W. Engle 认为这种游戏的功能还有待证明，故B项正确。
3．The underlined word in Paragraph 3 most probably means “________”． A．stopping the brain aging B．having the brain working C．making the brain more passive D．speeding up the brain aging
解析：选A 词义猜测题。根据第三段最后一句“In other words, repeating a game over and over again teaches you how to play the game and get better at it but your brain aging won't