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1、Unit 4Wildlife protection【导语】专家指出：地球上的动植物物种正以前所未有的速度消失，而无论是它们栖息地的丧失、污染，还是全球变暖带来的间接影响，祸根都源于人类。北部白犀牛小嘴狐猴Extinction is for ever!As almost everyone knows，to become extinct is to be gone for ever.Even before mans arrival on Earth，species became extinct quite naturally.Natural extinction happens when a sp
2、ecies decreases in numbers gradually but steadily at the end of its evolutionary period on Earth.The length of this period depends on how well a species can get used to changes around it.This process of extinction can take a very long timesometimes several million yearsand the extinction of one spec
3、ies is immediately followed by the appearance of another in a continuous cycle.The case of the dinosaurs is the most wellknown example of natural extinction.They appeared on Earth about 200 million years ago and dominated （统治）both land and sea for almost 100 million years.It is not certain why the d
4、inosaurs became extinct，but their disappearance was a natural one and new species of animals evolved to replace them.The rate of extinction has speeded up unnaturally over the last 400 years，rising sharply since 1990.This increase in the rate of extinction is directly related to the increase in the
5、human population over the same period of time.The great number of humans has caused great damage to the planet，as wild habitats have been taken over，forcing animals and plants into smaller and smaller areas，until some of them have become extinct.We have also polluted some habitats with chemicals and
6、 waste，making them unfit for wildlife.These causes of extinction are known as indirect destruction. Animals may also become extinct through direct destruction.This includes the hunting and catching of animals.Man has always hunted and killed wildlife but when early humans lived more in harmony with
7、nature，they killed animals for essential food and clothing.When firearms were invented，great destruction of species was possible.Animals have been，and still are，killed for meat，clothing，medicines，feathers，eggsand sometimes just for amusement.Some species are still caught in the wild for the live pet
8、 trade，even though their numbers are decreasing.The extinction of at least 500 species of animals has been caused by man.Today there are about 5，000 endangered animals and at least one species dies out every year.There are probably many more which become extinct without anyone knowing.【词海拾贝】1extinct
9、ion n灭绝；绝种2steadily adv.平稳地3continuous adj.连续不停的；不间断的 4habitat v栖息地5destruction n破坏【问题思考】阅读短文，判断正(T)误(F)。1Before man arrived on Earth，species were not extinct.()2Scientists are quite sure why the dinosaurs became extinct.()3The increase in the human population causes the increase in the rate of exti
10、nction over the same period of time.()答案：1.F2.F3.T.将单词与其正确释义配对1decreaseA鉴赏；感激；意识到2reserve B安全的；可靠的3hunt C雇佣；利用4respond D减少；变小5contain E包含；容纳；容忍6affect F保护区7appreciate G成功；接替；继任8succeed H回答；响应；做出反应9secure I损害；危害10income J收入11employ K打猎；猎取；搜寻12harm L影响；感动；侵袭答案：1.D2.F3.K4.H5.E6.L7.A8.G9B10.J11.C12.I.根据
11、所给汉语提示写出单词1_n仁慈，宽恕；怜悯2_v咬；叮；刺痛3_vt检查；视察4_n事件；事变5_adj凶猛的；猛烈的答案：1.mercy2.bite3.inspect4.incident5.fierce.根据英语释义写出单词1_： far away in space or time2_： feeling of comfort when something worrying has ended or not happened3_： to keep someone or something safe from harm4_： be able to control events5_： be imp
12、ortant答案：1.distant2.relief3.protect4.powerful5.importance.选用短语的适当形式完成句子decrease to; in peace; in danger; burst into laughter；pay attention to; do harm to; protect. from; in relief；die out; at the mercy of1Reading in bed for a long time will_your eyes.2Every student should_what your teacher said in c
13、lass.3The two countries have been living together _4No one was injured in the accident; we all smiled_5Its high time that we should take measures to protect these old traditions before they_6The poor cat is_the naughty boy.7Hearing the funny story, all of the boys_8Childrens lives are_every time the
14、y cross the road.9The government is doing the best to _those rare animals_ being hunted.10The number of the rare birds in this area has_about ninety.答案：1.do harm to2.pay attention to3.in peace4in relief5.die out6.at the mercy of7.burst into laughter8.in danger9.protectfrom10.decreased to课文表层理解.判断正(T)误(F)1The antelope in Tibet becomes an endangered species because of its fur being used to make sweaters.()2The living conditions of the elephants are worse than they were.()3What the government of Zimbabwe did provide us with a good example of how to protect wildlif
