雅思基础语法练习及答案.doc

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1、雅思基础语法练习Completethefollowingsentencesbycirclingthemissingwords.1.Sciencestillacureforcancer.a.doesn’tfindc.hasn’tfoundb.haven’tfoundd.aren’tfinding2.WhilehearoutetotheIndies,ColumbusdiscoveredAmerica.a.searchedc.hadsearchedforb.wasdiscoveringd.wassearchingfor3.Existingre

2、servesoffossilfuelby2045.a.havebeenrunoutc.isgoingtoberunoutb.willhaverunoutd.haverunout4.Ifloggingoftropicalrainforestscontinuesatthepresentrate,a30percentincreaseinatmosphericCO2bytheyear2000.a.therewillbec.therewouldbeb.theremighthavebeend.therecouldnothavebeen5.Onlyb

3、yinvestingheavilyinvalue-addedexportsfromthepresenttradeimbalance.a.thecountrycanemergec.canthecountryemergeb.thecountrymightemerged.thecountryemerged6.Themysteryofthedoublehelix,thescopeforgeneticengineeringdramaticallyincreased.a.havingsolvedc.solvingb.havingbeensolved

4、d.solved7.Sincethemid-’60sconsiderableresearchinembryotransplants.a.hascarriedoutc.hasbeencarriedoutb.wasdoned.wascarriedout8.severalhypotheseshavebeenadvancedforthedisappearanceofthedinosaur,noconclusiveevidencesupportsanyofthem.a.despitec.althoughb.inspiteofd.inspiteof

5、thefact9.Untilthe16thcenturytheearthtobeflat.a.isbelievedc.believedb.hasbeenbelievedd.wasbelieved10.Ifthetemperatureofthereactor500Chighermeltdownwouldhaveoccurred.a.wasc.wasbeingb.hadbeend.had11.adequateprecautionsaretake,thereisnoriskinvolvedintheoperation.a.Althoughc.

6、Neverthelessb.Providingd.Even12.Mysupervisoradvisedmetotheproblem.a.lookaheadc.lookoutofb.lookdownd.lookinto13.Themoreacidyouaddtothesolution,itbecomes.a.cloudierc.thecloudiestb.thecloudierd.morecloudy14.Thelecturersaid‘It’stimeyoutheliteraturereview.’a.beganc.shouldbegi

7、nb.begind.arebeginning15.Afterstudyingourexperimentalresults,thetutorsuggestedtheexperiment.a.ustorepeatc.werepeatb.thatwetorepeatd.metorepeat16.Afteryourresultsyoushouldmakeanappointmentwithyourtutor.a.youreceivingc.youhavereceivedb.youwouldhavereceivedd.youreceived17.Y

8、outheexperimenttwice,notonce.a.shouldhavecarriedoutc.haven’tcarriedoutb.shouldn’thavecarriedoutd.couldn