2020版高考英语一轮复习Unit5Thepowerofnature课时作业（含解析）新人教版选修6

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1、Unit5Thepowerofnature课时作业Ⅰ.阅读理解(2019·河北黄骅中学模拟)Ofallnature'sdisasters，forestfiresareoftenconsideredthemostfrightening.Movingatlightningspeed，hugewallsofflamescanburnacresoflandinjustafewminutes.Andalthoughtechnology，includingtheuseoffire－retardantchemicals，hasgrea

2、tlyhelpedthefightagainstforestfires，theystilldogreatdamage.AccordingtotheNationalInteragencyFireCenter，thefireseasonlastyearwastheworstonrecordintermsofthenumberoffiresandacresburned.Therewere96.385firesand9.873429acresaffectedbyfireinayearthatwas125%moredestruct

3、ive(毁灭性的)thanthe10－yearaverage.Thesefirescostthefederalgovernment$1.5billiontofight，andthisfiguredoesnotincludethemoneyspentbylocalandstategovernmentsaspartoftheeffort.FiresinthesouthernstatesrepresentedhalfofthenationaltotallastyearwithTexas，OklahomaandArkansasb

4、einghometoausuallyhighamountofactivity.WildfirehasalsotakenplaceinWesternstatessuchasCalifornia，ColoradoandAlaskathroughoutthepast10years.Itissaidthattwo－thirdsofforestfiresarestartedaccidentallybypeople.Almostonequarterarepurposelyset，whilelightingcauses10%.Fore

5、stfirescanhaveadvantageouseffects.Charcoal(木炭)enrichessoilandsomeplantspecies(种类)growwellafterfire.Theconesofthejackpinetree，forexample，willnotspreadtheirseedsunlessthereisheat.Douglasfirtreesgrowbestinopensunlightareasafterfire.【语篇解读】　本文主要讲了森林火灾被认为是最令人害怕的，因为它们蔓延

6、得太快，造成的损失太巨大。作者对造成森林火灾的原因进行了分析，并且说明了森林火灾也有一些优点。1．Forestfiresareconsideredtobethemostfrighteningbecause________.A．fire－retardantchemicalscan'tbemadeuseofB．hugewallsofflamescanburnacresoflandC．theymakethegreatestlossofalldisastersD．theyspreadtoofastanddogreatdamage

7、【答案】　D　细节理解题。由Movingatlightningspeed，hugewallsofflamescanburnacresoflandinjustafewminutes.Andalthoughtechnology，includingtheuseoffire－retardantchemicals，hasgreatlyhelpedthefightagainstforestfires，theystilldogreatdamage.可知森林火灾被认为是最令人害怕的，是因为它们蔓延得太快，造成的损失太巨大，选D。2．Al

8、most25%forestfiresareset____.A．unexpectedlyB．bylighting　C．onpurposeD．naturally【答案】　C　细节理解题。由Almostonequarterarepurposelyset，whilelightingcauses10%.可知几乎25%的森林火灾