学年高中英语 Unit 4 Wildlife protection课时作业 新人教版必修2.docx

学年高中英语 Unit 4 Wildlife protection课时作业 新人教版必修2.docx

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学年高中英语Unit4Wildlifeprotection课时作业新人教版必修2

2019-2020学年高中英语Unit4Wildlifeprotection课时作业新人教版必修2

【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

Extinctionisforever!

Asalmosteveryoneknows，tobecomeextinctistobegoneforever.Evenbeforeman'sarrivalonEarth，speciesbecameextinctquitenaturally.NaturalextinctionhappenswhenaspeciesdecreasesinnumbersgraduallybutsteadilyattheendofitsevolutionaryperiodonEarth.Thelengthofthisperioddependsonhowwellaspeciescangetusedtochangesaroundit.Thisprocessofextinctioncantakeaverylongtime—sometimesseveralmillionyears—andtheextinctionofonespeciesisimmediatelyfollowedbytheappearanceofanotherinacontinuouscycle.

Thecaseofthedinosaursisthemostwell－knownexampleofnaturalextinction.TheyappearedonEarthabout200millionyearsagoanddominated（统治）bothlandandseaforalmost100millionyears.Itisnotcertainwhythedinosaursbecameextinct，buttheirdisappearancewasanaturaloneandnewspeciesofanimalsevol

vedtoreplacethem.

Therateofextinctionhasspeededupunnaturallyoverthelast400years，risingsharplysince1990.Thisincreaseintherateofextinctionisdirectlyrelatedtotheincreaseinthehumanpopulationoverthesameperiodoftime.Thegreatnumberofhumanshascausedgreatdamagetotheplanet，aswildhabitatshavebeentakenover，forcinganimalsandplantsintosmallerandsmallerareas，untilsomeofthemhavebecomeextinct.Wehavealsopollutedsomehabitats

withchemicalsandwaste，makingthemunfitforwildlife.Thesecausesofextinctionareknownasindirectdestruction.

Animalsmayalsobecomeextinctthroughdirectdestruction.Thisincludesthehuntingandcatchingofanimals.Manhasalwayshuntedandkilledwildlifebutwhenearlyhumanslivedmoreinharmonywithnature，theykilledanimalsforessentialfoodandclothing.Whenfirearmswereinvented，greatdestructionofspecieswaspossible.Animalshavebeen，andstillare，killedformeat，clothing，medicines，feathers，eggs—andsometimesjustforamusement.Somespeciesarestillcaughtinthewildforthelivepettrade，eventhoughtheirnumbersaredecreasing.

Theextinctionofatleast500speciesofanimalshasbeencausedbyman.Todaythereareabout5，000endangeredanimalsandatleastonespeciesdiesouteveryyear.Thereareprobablymanymorewhichbecomeextinctwithoutanyoneknowing.

【词海拾贝】

1．extinction　n．灭绝；绝种

2．steadilyadv.平稳地

3．continuousadj.连续不停的；不间断的

4．habitatv．栖息地

5．destructionn．破坏

【问题思考】

阅读短文，判断正（T）误（F）。

1．BeforemanarrivedonEarth，specieswerenotextinct.（　　）

2．Scientistsarequitesurewhythedinosaursbecameextinct.（　　）

3．Theincreaseinthehumanpopulationcausestheincreaseintherateofextinctionoverthesameperiodoftime.（　　）

答案：

1.F　2.F　3.T

Ⅰ.将单词与其正确释义配对

1．decrease　　　　A．鉴赏；感激；意识到

2．reserveB．安全的；可靠的

3．huntC．雇佣；利用

4．respondD．减少；变小

5．containE．包含；容纳；容忍

6．affectF．保护区

7．appreciateG．成功；接替；继任

8．succeedH．回答；响应；做出反应

9．secureI．损害；危害

10．incomeJ．收入

11．employK．打猎；猎取；搜寻

12．harmL．影响；感动；侵袭

答案：

1.D　2.F　3.K　4.H　5.E　6.L　7.A　8.G　

9．B　10.J　11.C　12.I

Ⅱ.根据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.mercy　2.bite　3.inspect　4.incident　5.fierce

Ⅲ.根据英语释义写出单词

1．________：

farawayinspaceortime

2．________：

feelingofcomfortwhensomethingworrying

hasendedornothappened

3．________：

tokeepsomeoneorsomethingsafefromharm

4．________：

beabletocontrolevents

5．________：

beimportant

答案：

1.distant　2.relief　3.protect　4.powerful　5.importance

Ⅳ.选用短语的适当形式完成句子

decreaseto;inpeace;indanger;burstintolaughter；payattentionto;doharmto;protect...from;inrelief；dieout;atthemercyof

1．Readinginbedforalongtimewill________________youreyes.

2．Everystudentshould________________whatyourteachersaidinclass.

3．Thetwocountrieshavebeenlivingtogether_____．

4．Noonewasinjuredintheaccident;weallsmiled_______．

5．It'shightimethatweshouldtakemeasurestoprotecttheseoldtraditionsbeforethey______________．

6．Thepoorcatis________________thenaughtyboy.

7．Hearingthefunnystory,alloftheboys_____________．

8．Children'slivesare____________________everytimetheycrosstheroad.

9．Thegovernmentisdoingthebestto________thoserareanimals________beinghunted.

10．Thenumberoftherarebirdsinthisareahas_______aboutninety.

答案：

1.doharmto　2.payattentionto　3.inpeace

4．inrelief　5.dieout　6.atthemercyof　7.burstintolaughter　8.indanger　9.protect　from　10.decreasedto

课文表层理解

Ⅰ.判断正（T）误（F）

1．TheantelopeinTi

betbecomesanendangeredspeciesbecauseofitsfurbeingusedtomakesweaters.（　　）

2．Thelivingconditionsoftheelephantsareworsethantheywere.（　　）

3．WhatthegovernmentofZimbabwedidprovideuswit