雅思基础语法练习及答案.pdf

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1、精品文档雅思基础语法练习1.Sciencestillacureforcancer.a.doesn’tfindc.hasn’tfoundb.haven’tfoundd.aren’tfinding2.WhilehearoutetotheIndies,ColumbusdiscoveredAmerica.a.searchedc.hadsearchedforb.wasdiscoveringd.wassearchingfor3.Existingreservesoffossilfuelby2045.a.havebeenrunout

2、c.isgoingtoberunoutb.willhaverunoutd.haverunout4.Ifloggingoftropicalrainforestscontinuesatthepresentrate,a30percentincreaseinatmosphericCO2bytheyear2000.a.therewillbec.therewouldbeb.theremighthavebeend.therecouldnothavebeen5.Onlybyinvestingheavilyinvalue-addede

3、xportsfromthepresenttradeimbalance.a.thecountrycanemergec.canthecountryemergeb.thecountrymightemerged.thecountryemerged6.Themysteryofthedoublehelix,thescopeforgeneticengineeringdramaticallyincreased.a.havingsolvedc.solvingb.havingbeensolvedd.solved7.Sincethemid

4、-’60sconsiderableresearchinembryotransplants.a.hascarriedoutc.hasbeencarriedoutb.wasdoned.wascarriedout8.severalhypotheseshavebeenadvancedforthedisappearanceofthedinosaur,noconclusiveevidencesupportsanyofthem.a.despitec.althoughb.inspiteofd.inspiteofthefact9.Un

5、tilthe16thcenturytheearthtobeflat.a.isbelievedc.believedb.hasbeenbelievedd.wasbelieved10.Ifthetemperatureofthereactor500Chighermeltdownwouldhaveoccurred.a.wasc.wasbeingb.hadbeend.had11.adequateprecautionsaretake,thereisnoriskinvolvedintheoperation.a.Althoughc.N

6、everthelessb.Providingd.Even12Mysupervisoradvisedmetotheproblem..1。欢迎下载精品文档a.lookaheadc.lookoutofb.lookdownd.lookinto13Themoreacidyouaddtothesolution,itbecomes..a.cloudierc.thecloudiestb.thecloudierd.morecloudy14Thelecturersaid‘It’stimeyoutheliteraturereview.’.

7、a.beganc.shouldbeginb.begind.arebeginning15Afterstudyingourexperimentalresults,thetutorsuggestedtheexperiment..a.ustorepeatc.werepeatb.thatwetorepeatd.metorepeat16Afteryourresultsyoushouldmakeanappointmentwithyourtutor..a.youreceivingc.youhavereceivedb.youwould

8、havereceivedd.youreceived17Youtheexperimenttwice,notonce..a.shouldhavecarriedoutc.haven’tcarriedoutb.shouldn’thavecarriedoutd.couldn’thavecarriedout18Itlooksyou’vemadeamista