高中英语 unit 4 wildlife protection练习试题 新人教版必修

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1、系统掌握蕴含其中的马克思主义立场观点方法，要在系统学习、深刻领会、科学把握习近平教育思想上下功夫。精心组织开展学习宣传贯彻习近平新时代中国特色社会主义思想和党的十九大精神知识问答活动。Unit4　Wildlifeprotection【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'sar

2、rivalonEarth，speciesbecameextinctquitenaturally.NaturalextinctionhappenswhenaspeciesdecreasesinnumbersgraduallybutsteadilyattheendofitsevolutionaryperiodonEarth.Thelengthofthisperioddependsonhowwellaspeciescangetusedtochangesaroundit.Thisprocessofextinctioncantakeaverylongtime—sometimesse

3、veralmillionyears—andtheextinctionofonespeciesisimmediatelyfollowedbytheappearanceofanotherinacontinuouscycle.Thecaseofthedinosaursisthemostwell－knownexampleofnaturalextinction.TheyappearedonEarthabout200millionyearsagoanddominatedbothlandandseaforalmost100millionyears.Itisnotcertainwhyth

4、edinosaursbecameextinct，buttheirdisappearancewasanaturaloneandnewspeciesofanimalsevolvedtoreplacethem.Therateofextinctionhasspeededupunnaturallyoverthelast400years，risingsharplysince1990.Thisincreaseintherateofextinctionisdirectlyrelatedtotheincreaseinthehumanpopulationoverthesameperiodof

5、time.Thegreatnumberofhumanshascausedgreatdamagetotheplanet，aswildhabitatshavebeentakenover，forcinganimalsandplantsintosmallerandsmallerareas，untilsomeofthemhavebecomeextinct.Wehavealsopollutedsomehabitatswithchemicalsandwaste，makingthemunfitforwildlife.Thesecausesofextinctionareknownasind

6、irectdestruction.Animalsmayalsobecomeextinctthroughdirectdestruction.Thisincludesthehuntingandcatchingofanimals.Manhasalwayshuntedandkilledwildlifebutwhenearlyhumanslivedmoreinharmonywithnature，theykilledanimalsforessentialfoodandclothing.Whenfirearmswereinvented，greatdestructionofspecies

7、was通过党课、报告会、学习讨论会等多种形式，组织党员读原著、学原文、悟原理，进一步掀起学习贯彻新高潮，教育引导广大党员更加自觉用习近平新时代中国特色社会主义思想武装头脑、指导实践、推动工作。系统掌握蕴含其中的马克思主义立场观点方法，要在系统学习、深刻领会、科学把握习近平教育思想上下功夫。精心组织开展学习宣传贯彻习近平新时代中国特色社会主义思想和党的十九大精神知识问答活动。possible.Animalshavebeen，andstillare，killedformeat，clothing，medicines，feathers