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  【IfthepopulationoftheEarthkeepson__61._(increase)atitspresentrate,therewill__62._(event)notbeenoughresourceslefttosupportlifeontheplanet.Bythemiddleofthe21stcentury,ifpresenttrendscontinue,we__63_(use)upall】

  IfthepopulationoftheEarthkeepson__61._(increase)atitspresentrate,therewill__62._(event)notbeenoughresourceslefttosupportlifeontheplanet.Bythemiddleofthe21stcentury,ifpresenttrendscontinue,we__63_(use)upalltheoilthatdriveourcarsforexample.EvenifscientistsdevelopnewwaysoffeedingthehumanracethecrowdedconditionsonEarthwillmakeit__64 (necessity)forustolookforsomewhereelse.But__65._oftheotherplanetsinoursolarsystemarecapableofsupportinglifeatpresent.Onepossiblesolutiontotheproblem,__66._,hasrecentlybeensuggestedbyanAmericanscientistProfessorCarlSagan.Sagarnbelievesthat__67._theEarth’sresourcesarecompletely__68_(exhaust),itwillbepossibletochangetheatmosphereofVenusand__69_createanewworldalmostaslargeasEarthitself.Somethingisdifficult.VenusismuchhotterthantheEarth.__70._,thereisonlyatinyamountofwaterthere.

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2020-01-31 22:28
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刘鑫屏

  61.解析: 考查短语keepondoing的用法。答案:increasing62.解析: Therewillnotbeenoughresources的主谓结构是完整的,所以只能用event的副词形式e...

2020-01-31 22:29:51

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