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2017年6月大学英语四级考试阅读理解每日一练(10)思维导图

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查看详情2017年6月大学英语四级考试阅读理解每日一练(10)思维导图

  距离2017年6月大学英语四级考试还有一个半月的时间,已经报名的同学备考一定要抓紧,不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解每日一练,每天一道题考试不担心。

树图思维导图提供 2017年6月大学英语四级考试阅读理解每日一练(10) 在线思维导图免费制作,点击“编辑”按钮,可对 2017年6月大学英语四级考试阅读理解每日一练(10)  进行在线思维导图编辑,本思维导图属于思维导图模板主题,文件编号是:faefe03c08110fe3421a26d3ff89648c

思维导图大纲

2017年6月大学英语四级考试阅读理解每日一练(10)思维导图模板大纲

距离2017年6月大学英语四级考试还有一个半月的时间,已经报名的同学备考一定要抓紧,不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解每日一练,每天一道题考试不担心。

Ifthepopulationoftheearthgoesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourceslefttosustainlifeontheplanet.Bythemiddleofthe21stcentury,ifpresenttrendscontinue,wewillhaveusedupalltheoilthatdrivesourcars,forexample.Evenifscientistsdevelopnewwaysoffeedingthehumanrace,thecrowdedconditionsonearthwillmakeitnecessaryforlustolookforopenspacesomewhereelse.Butnoneoftheotherplanetsinoursolarsystemarecapableofsupportinglifeatpresent.Onepossiblesolutiontotheproblem,however,hasrecentlybeensuggestedbyAmericanscientist,ProfessorCarlSagan.

Saganbelievesthatbeforetheearth'sresourcesarecompleetelyexhausteditwillbepossibletochangetheatmophereofVenusandsocreateanewworldalmostaslargeasearthitself.ThedifficultisthatVenusismuchhotterthantheearthandthereisonlyatinyamountofwaterthere.

Saganproposesthatalgaeorganismsthatcanliveinextremelyhotorcoldatmospheresandatthesametimeproduceoxygen,shouldbebredinconditionsimilartothoseonVenus.Assoonasthishasbeendone,thealgaewillbeplacedinsmallrockets.SpaceshipwillthenflytoVenusandfiretherocketsintotheatmosphere.Inafairlyshorttime,thealgewillbreakdownthecarbondioxideintooxygenandcarbon.

Whenthealgaehavedonetheriwork,theatmospherewillbecomecooler,butbeformancansetfootonVenusitwillbeneccessaryfortheoxygentoproducerain.ThesurfaceoftheplanetwillstillbetoohotformantolandonitbuttherainwilleventuallyfallandinafewyearssomethinglikeearthwillbereproducedonVenus.

1.Intelongrun,themostinsolubleproblemcausedbypopulationgrowthonearthwillprobablybethelackof______.

a.food

b.oil

c.space

d.resources

2.CarlSaganbelievesthatVenusmightbecolonizedfromearthbecause_____

a.itmightbepossibletochangeitsatmosphere

b.itsatmosphereisthesameastheearth's

c.thereisagoodsupplyofwateronVenus

d.thedaysonVenusarelongenough

3.OnVenusthereisalotof________.

a.water

b.carbondioxide

c.carbonmonoxide

d.oxygen

4.Algaeareplantsthatcan____.

a.liveinveryhottemperatures

b.liveinverycoldtemperatures

c.manufactureoxygen

d.alloftheabove

5.MancanlandonVenusonlywhen_______.

a.thealgaehavedonetheirwork

b.theatmospherebecomescooler

c.thereisoxygen

d.itrainsthere

答案:cabdd

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