1、Unit 4 Wildlife ProtectionPeriod OneWarming Up & ReadingPrereading.阅读理解AMore than two thirds of the worlds polar bears will be wiped out by 2050，according to a shocking new study.By then，scientists say，global warming will have melted 42 percent of the Arctic sea ice.By 2100，only a very few of these
2、important creatures will be left.The report has been produced by the US Geological Survey.The scientists have publicized their findings in the hope of influencing US Interior Secretary Dirk Kempthorne，who has been asked to put polar bears on the US endangered species list.Polar bears depend on float
3、ing sea ice as a platform for hunting seals，which are their main food.Without enough ice，polar bears would be forced to go onto the land，where they are poorly skilled hunters，and would be unlikely to adapt to the life on the land in time.Experts say few little bears would survive and the stress coul
4、d make many females unable to get pregnant.The team of American and Canadian scientists spent six months studying bears，on the ground，from spotter planes and in the lab，using computer models.Some team members fear the result is even worse for the bears than what their report says.They say the Arctic
5、 is warming faster than anywhere in the world and much faster than their computer has been forecasting.Satellite observations have showed that the ice has decreased to an alltime low.However，not everyone in the scientific community believes that global warming is happening on such an alarming scale.
6、Another investigation has found that polar bears are still being hunted by wealthy “sportsmen” who want their skins and heads.At least ten international companies offer bearhunting trips.语篇解读本文通过北极变暖导致北极熊急剧减少的例子来呼吁人们关注全球变暖，同时提高对濒危动物的保护意识。1What do we know about Dirk Kempthorne according to the passag
7、e？AHe is an animal scientist.BHe is a protector of animals working for the US government.CHe has been asked to put polar bears on the US endangered species list.DHe has offered to put polar bears on the endangered species list.答案C解析细节理解题。根据第二段第二句中的“.US Interior Secretary Dirk Kempthorne，who has been
8、 asked to put polar bears on the US endangered species list.”可知C项正确。2.Why will polar bears die out if there is not enough sea ice？ABecause polar bears cant catch enough food without ice.BBecause polar bears eat ice when they feel thirsty.CBecause polar bears will be easily found by hunters without i
9、ce.DBecause most female bears are used to giving birth under ice.答案A解析推理判断题。由第三段第一句“Polar bears depend on floating sea ice as a platform for hunting seals，which are their main food.”可知A项正确。3After a sixmonth study，some scientists fear that .Athere is something wrong with their computersBpolar bears w
10、ill disappear even faster than they have ever expectedCtheir computer models are not as accurate as they expectedDglobal warming will destroy everything in the Arctic答案B解析细节理解题。由第四段第二句“Some team members fear the result is even worse for the bears than what their report says.”可知B项正确。BFour animalsa wi
11、ldcat，a mongoose，a mouse and an owlhad made their home in a huge tree.The mouse and the mongoose lived at the foot of the tree in two different holes.The cat lived in a large hole halfway up the tree and the owl lived in the branches.The cat feared none of its neighbours and moved about，afraid of no
12、thing.The owl and the mongoose were afraid of the cat and kept a safe distance from it.The mouse was extremely afraid of all three neighbours.One day the cat was caught in a trap laid by a hunter.Its three neighbours watched with joy as it tried extremely hard to get out of the net in which it had b
13、een trapped.They knew it was a hopeless task.Soon the hunter would come and they would never see their enemy forever.The mouses joy，however，was shortlived because even as it watched the cat，it found that the mongoose was moving towards it.Looking up，it saw that the owl too was getting ready to move
14、down.The mouse understood that it was in great danger and that the only one who could save it was its enemy，the cat.It jumped onto the net in which the cat was caught and began biting at it.Within a short time it had made a hole big enough for the cat to come out.Seeing the cat come out，the owl and
15、the mongoose escaped.The mouse ran away too.It knew it could not expect any thanks from the cat，but in saving it，it had saved its own life.语篇解读野猫吃猫头鹰和獴，三者都吃老鼠。野猫被猎人设下的陷阱捉住后，猫头鹰和獴都想去捉老鼠，聪明的老鼠救了猫来保全自己。4The mouse lived in extreme fear every day because .Ait lived at the foot of the treeBhunters set tra
16、ps everywhereCall its three neighbours might eat it at any timeDits food might be taken away by its neighbours答案C解析推理判断题。根据第三段最后一句、第四段中獴和猫头鹰对老鼠的虎视眈眈以及最后一段中老鼠将野猫放出来后自己也逃离了等内容可知，这三个邻居都对老鼠有生命威胁，因此它每天都生活在极度恐慌之中。5Which of the four neighbours had the most power over the other three？AThe wildcat. BThe mous
17、e.CThe mongoose. DThe owl.答案A解析细节理解题。根据第三段可知，野猫无所畏惧，四处乱逛；猫头鹰和獴害怕野猫；老鼠害怕前三者。由此可知，在这四个邻居中，野猫最强势。6The mouse bit at the net to save the cat because .Athey were good friendsBthey both hated the huntersCthe mouse was too kind to see the cat dieDthe other two neighbours were to attack it答案D解析细节理解题。根据第四段最后三
18、句可知，野猫被困住之后，獴和猫头鹰没有了天敌的威胁，于是准备攻击老鼠。老鼠意识到如果没有了野猫，自己面临的威胁更大，所以才救了野猫。7From the passage we can learn that the mouse is .Akind BbraveCclever Dstupid答案C解析推理判断题。老鼠救了猫来保全自己，但也不寄希望于猫会感谢自己，也逃跑了。由此可推知，老鼠是聪明的。CSeal Island is a 200meter long island in South Africa，which is surrounded by 55 to 57 degrees Fahrenhe
19、it waters and covered with over 60，000 seals and some birds.This island has been home to many birds and seals.You may think this island is a paradise.In fact，the island is not famous for the seals or birds.However，the real stars are the great white sharks that leap out of the water to catch the seal
20、s they are hunting.You may think that there is no way for a 15foot long，3，000pound shark to hurl its body out of the water and catch a seal in midair.Actually，these sharks are called “Air Jaws”Over the years，the seals have gotten smarter.Now，they go out in groups of seven and eight to feed.They swim
21、 down on the sea floor，which gives them extra camouflage(掩饰)When they have to swim near the water surface，they swim in a zigzag(之字形的) pattern.But with all these tricks，they can still be outwitted(以智取胜) by the sharks.Usually，the sharks will take one seal away from its group and force it to swim on th
22、e surface，where it is easy to hunt.Sometimes，the seal is lucky and gets away，but most of them die in the process of trying to survive.Every year，tourists go to see these amazing animals leap out of the water，sometimes flinging(抛) their whole bodies into the air when they want to catch the seals.Some
23、 people even want to go into shark cages to see the action from below! This is the reason why this island attracts thousands of tourists around the world every year.语篇解读本文是说明文。作者向我们介绍了位于南非的海豹岛。在该岛周边的水域大白鲨常常跳出水面猎食海豹，这一景象吸引了许多游客前去观看。8What probably makes Seal Island famous？AThe large number of seals in
24、 the water.BThe way the great white sharks hunt.CThe beautiful scenery of the island.DThe special position of the island.答案B解析推理判断题。根据第一段最后一句“However，the real stars are the great white sharks that leap out of the water to catch the seals they are hunting.”可知，大白鲨跳出水面捕食海豹是海豹岛闻名于世的主要原因。9Why do the seal
25、s swim in a zigzag pattern？ATo save energy.BTo warm themselves.CTo look for food.DTo avoid the white sharks.答案D解析推理判断题。第三段列举了海豹躲避大白鲨的方法，其中一种方法就是在水里“之”字形游动。10We can infer from the third paragraph that .Awhite sharks are dangerous animalsBthe seals are cleverer than the white sharksCthe sharks are suc
26、cessful in hunting the sealsDit is easier for the sharks to hunt the seals on the sea floor答案C解析推理判断题。根据第三段可知，多年来海豹虽然变聪明了，但它们还是难逃被大白鲨捕食的厄运，这说明大白鲨的捕食很成功。11What is the authors purpose in writing the passage？ATo explain why Seal Island is famous.BTo show how white sharks hunt seals.CTo advise us to vis
27、it Seal Island.DTo ask us to protect animals.答案A解析写作意图题。通过文章第一段以及最后一段可知，本文主要向我们介绍了海豹岛世界闻名的原因。.七选五How to get siblings(兄弟姐妹) to get alongOne of the greatest gifts of parenthood is seeing your children form a relationship with each other that is independent of you.By giving them someone else to play wi
28、th，you can free up some time for yourself.Here are four techniques you can use to help your children appreciate each other while they are young. 12 The No.1 thing parents can do to help their kids stay on good terms with each other is not to compare them with each other.Never say “Your sister never.
29、” or “Why cant you do what your brother does？” 13 Stay out of the way.Try not to get too involved(参与) in your kids arguments.Learning cooperation and problemsolving is an important skill in life. 14 And dont blame the older one for not “knowing better”That puts pressure on the older child and leads
30、to unhappiness.Activities and opportunities.Have your kids go to their siblings games and activities. 15 “My kids go to each others activities，and take part in activities together，” says Patricia WaltersFischer，mother of two.Not only do her children go，but they also offer support，encouraging each ot
31、her before a big game or performance and offering comfort when things dont go well.Vacations.Dont ignore the value of a family vacation for bringing siblings together.When kids are away from their friends and forced to spend time together，they often enjoy each other. 16 In fact，a weekend camping tri
32、p offers some of the best opportunities for working together，having fun and experiencing something new.ADont compare.BNever shout at them.CThat only serves to fuel the competition.DIt doesnt need to be anything extremely great.EThey may need help solving a conflict，but try not to take sides.FGive th
33、em a project，and they will learn how to work together.GGet them involved in one anothers lives，so they can have a better appreciation of who their sibling is.语篇解读本文属于教育类短文，介绍了4条如何让家庭中的兄弟姐妹和睦相处的建议。12答案A解析根据横线后句“The No.1 thing parents can do to help their kids stay on good terms with each other is not
34、 to compare them with each other.”可知，第一个建议就是不要比较孩子们。故A项符合本段中心思想。13答案C解析根据横线前句“Never sayYour sister never. or Why cant you do what your brother does？”可知，本段建议父母不要对孩子进行比较，比较只会让竞争激烈。故选C。14答案E解析本段小标题“Stay out of the way.”及后一句“Try not to get too involved(参与) in your kids arguments.”可知，当孩子们之间发生争论的时候，父母亲不要偏袒，要让孩子们自己去解决问题。故E项符合上下文语境。15答案G解析根据横线后句“My kids go to each others activities，and take part in activities together”可知，我们要让孩子相互参加对方的活动，站在对方的立场看问题。这样做可以让相互之间的理解更加深入。故选G。16答案D解析本段主要介绍的是通过假期活动让孩子增进理解。不需要做什么特别大的事情。实际上，一次周末野营旅行即可。故D项符合上下文语境。