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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