1、Unit 20 New Frontiers Period TwoLesson 2Artificial Intelligence 课时精练（北师大版选修7，广东专用）时间：40分钟.语法填空阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。Last week, I took my children to a restaurant. My sixyearold son asked _1_ he could say grace(做饭前的谢恩祈祷). As we bowed our heads he said. “Thank you for
2、the food, and I would even thank you _2_ if Mom gets us ice cream for dessert.”Along with the laughter from the other customers nearby, I heard a woman remark, “Kids today dont even know_3_to pray. Asking God for ice cream! I never do that！”_4_ (hear) this, my son burst into tears and asked me, “Did
3、 I do it wrong? Is God mad at me？”As I held him and assured him that he _5_ (do) a terrific job and God was certainly not angry with him, _6_ elderly gentleman approached the table. He winked (眨眼)at my son and said, “I happened to know that God thought that was a great prayer.”“Really？” my son asked
4、.“Sure，” the man _7_. “Too bad she never asks God for ice cream. A little ice cream is good for the soul sometimes.”_8_(nature), I bought my kids ice cream. He picked up his sundae(圣代冰淇淋) and _9_ a word walked over and placed it in front of the woman. With a big smile, he told _10_， “Here, this is f
5、or you. Ice cream is good for the soul sometimes. and my soul is good already.”【解题导语】 孩子的心是最天真的，孩子的眼神是最无邪的，孩子的话语也是最简单的。请别用成年人的价值观去评判一个孩子小小的要求。1解析if/whether在句中引导宾语从句，意为“是否”。答案if/whether2解析语意为“如果妈妈给我们买冰激凌，我会更加感谢的”，由前面的even可知，此处应填more。答案more3解析根据下文，可知那位妇女是想说“现在的孩子连怎么祈祷都不知道”，故用how。答案how4解析hearing this相当
6、于状语从句when my son heard this。答案Hearing5解析空处的动作应发生在assured之前，故用过去完成时。答案had done6解析此处表示泛指，且elderly以元音音素开头，故填不定冠词an。答案an7解析从上文的asked可知此处是回答。答案replied/answered8解析位于句首修饰后面整个句子用副词，natural的副词形式为naturally。答案Naturally9解析without a word“一句话也没说”。答案without10解析her指代上文提到的a woman。答案her.阅读理解AWe bet that on cold wintr
7、y days，many of you love to stay in your warm home and，every now and then，come out into the kitchen for a snack.Unfortunately，plenty of creepycrawly critters(爬行生物)like to do the same thing!Winter is the time when bugs(虫子)invade your house without an invitation.The season can be tough for such creatur
8、es.In winter the air is cold，the ground is hard and many trees have no leaves.So bugs do what they have to do to survive.Monarch butterflies head south to warmer climates.Ants crowd in deep underground colonies and eat food they have been storing all year.Many insects go into a deep sleep called dia
9、pause.Therere different kinds of diapause，but all are similar to hibernation，a time when bigger animals become inactive in the cold.Insects go into an inactive period，too，but it often isnt when the temperature drops.They rely on more dependable signals in the environment.For example，many insects can
10、 tell how much sunlight theres each day.They use that to tell themselves when to shut down.Bugs are coldblooded，meaning that their inside temperature is the same as the outside.They cant move much when it gets below 40 degrees Fahrenheit.So they search for any warm place.Theyre looking for protectio
11、n.These guys have been doing this for 300 million years，so they dont really know theyre coming into your house.The home is a recent event in terms of their evolutionary behavior.They enter through tiny cracks or come in unnoticed on your clothes or shoes.Remember that they may be invading your homes
12、 for warmth and food，but they dont care about humans.【解题导语】 本文主要介绍的是：为什么虫子在冬天会入侵人类住所。1What is the purpose of the first paragraph?ATo point out that humans like to stay at home in winter.BTo mean that humans and bugs have the same living habits.CTo mean that bugs will invade humans houses for their w
13、inter.DTo put forward the idea that bugs are not welcome in winter.答案C推理判断题。根据文章第一段可知，虫子和人类一样，也会喜欢待在温暖的屋里，再结合文章的后面几段可知，本段暗示虫子在冬天会入侵人类住所。2According to the text，what is diapause?AIt is the same as the animals hibernation.BIt often appears in warm areas all the year.CIt is done to keep bugs active in w
14、inter.DIt is a deep sleep similar to hibernation.答案D细节理解题。根据文章第三段可知答案为D。3What often decides bugs diapause?AThe lower local temperature.BThe amount of sunlight.CKinds of environmental signals.DThe insects inside temperature.答案C细节理解题。根据文章第四段的“They rely on more dependable signals in the environment”可知，
15、虫子的“diapause”是由多种环境可依赖性因素决定的，不一定全靠温度或者光照。4According to the text，bugs invade humans homes to _.Aattack humansBlook for enough foodCseek for protectionDshow their evolutionary results答案C细节理解题。根据文章最后一段可知，虫子进屋是为了寻求保护，把自己置身于安全形势之下，而不仅仅是为了寻求食物。5What would be the best title for the text?ABugs life on cold
16、wintry daysBWhy do bugs invade your home in winter?CGood relations between humans and bugsDWhat does diapause mean?答案B标题概括题。整篇文章主要告诉读者的是：在冬天里，为什么虫子会入侵人类的住所。BTHURSDAY，July 9(Health Day News)A new study that found that a lowercalorie diet slowed the aging process in monkeys could be the best proof yet
17、 that restricted diets might do the same for humans.“The big question in aging research is，Will caloric restriction in species be closely related to humans slow aging？”said Richard Weindruch，senior author of a paper appearing in the July 10 issue of Science.This is the first clear demonstration that
18、，in a primate species，were inducing a slowdown of the aging processshowing increased survival，resistance to disease，less brain atrophy and less muscle loss.“This predicts humans would respond similarly，”added Weindruch，professor of medicine at the University of Wisconsin and an investigator at the V
19、eterans Hospital in Madison.Another expert noted that，despite some highly publicized studies in certain species，the link between restricted eating and longer lifespan has been far from proven.“The idea that dietary restriction extends lifespan in all species is not true.Many strains of rats and mice
20、 do not respond.In some strains，its actually deleterious，”explained Felipe Sierra，director of the biology of aging program at the US. National Institute on Aging(NIA)，which supported the new study.“The fact that it doesnt work in some mice but it does seem to work in monkeys is surprising and it giv
21、es us hope.”But theres a larger question：how to change humans increasingly lax eating habits.“This_finding_doesnt_give_me_hope_that_humans_are_going_to_go_into_dietary_restriction，”added Marianne Grant，a registered dietitian at Texas A&M Health Science Center Coastal Bend Health Education Center in
22、Corpus Christi.【解题导语】 这是一篇新闻报道，研究人员通过对动物的研究证明低热量的饮食可能会延长人的寿命。6The underlined word “restricted” means “_”Alimited Bsatisfied Creserved Dfascinated答案A词义猜测题。根据第一段可知，低热量的饮食可以延长猴子的寿命，这一试验证明有节制的饮食可能同样会延长人的寿命。7Which of the following statements about Weindruch is true?AThis experiment indicates restricted d
23、iets could extend humans lifespan.BAdequate sleep is another way to reduce the speed of aging process.CThe experiment was a failure in some species such as mice.DThe experiment which had been tested on humans got a great success.答案A细节理解题。根据第三段第一句话可知答案为A。8According to Felipe Sierras idea，we know that
24、 _.Athe restricted diets experiment really had no distinct effect on rats and miceBhumans are finding new ways to slow down the aging process of all the speciesCthe experiment is unnecessary to be carried on because of the response of the miceDthe experiment confirmed that restricted diets extend li
25、fespan in all species答案A细节理解题。从第四段的第二句“Many strains of rats and mice do not respond.”可知答案。9It can be inferred from the underlined sentence that _.Athe result of the experiment shows that humans are not pigging out nowadaysBnowadays humans are turning unhealthy diets into lowercalorie dietsChow to ch
26、ange humans careless eating habits is a long way to goDthe experiment changed humans increasingly careless eating habits答案C细节理解题。由画线句子可知人们目前并没有进入到控制饮食的状态中，也就是说要改变人们漫不经心的饮食习惯还有很长的路要走。10The author most likely wrote this text to _.Acompare the two experiments on rats and monkeysBillustrate the data from the researchCcall on people to pay attention to their daily dietsDintroduce a lively debate to amuse the reader答案C推理判断题。作者的目的是通过介绍试验“低热量的饮食可能会延长人的寿命”，呼吁人们注意控制饮食。
