雅思基础语法练习及答案

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.havebeenrunoutc.isgoingtoberunoutb.willhaverunoutd.haverunout4.Ifloggingoftropicalrainforestscontinuesatthepresentrate,a30percentincreaseinatmosphericCO2bytheyear2000.a.therewillbec.therewouldbeb.theremighthavebeend.therecouldnothavebeen5.Onlybyinvestingheavilyinvalue-addedexportsfromthepresenttradeimbalance.a.thecountrycanemergec.canthecountryemergeb.thecountrymightemerged.thecountryemerged6.Themysteryofthedoublehelix,thescopeforgeneticengineeringdramaticallyincreased.a.havingsolvedc.solvingb.havingbeensolvedd.solved7.Sincethemid-’60sconsiderableresearchinembryotransplants.a.hascarriedoutc.hasbeencarriedoutb.wasdoned.wascarriedout8.severalhypotheseshavebeenadvancedforthedisappearanceofthedinosaur,noconclusiveevidencesupportsanyofthem.a.despitec.althoughb.inspiteofd.inspiteofthefact9.Untilthe16thcenturytheearthtobeflat.a.isbelievedc.believedb.hasbeenbelievedd.wasbelieved10.Ifthetemperatureofthereactor500Chighermeltdownwouldhaveoccurred.a.wasc.wasbeingb.hadbeend.had11.adequateprecautionsaretake,thereisnoriskinvolvedintheoperation.a.Althoughc.Neverthelessb.Providingd.Even12.Mysupervisoradvisedmetotheproblem.a.lookaheadc.lookoutofb.lookdownd.lookinto13.Themoreacidyouaddtothesolution,itbecomes.a.cloudierc.thecloudiestb.thecloudierd.morecloudy14.Thelecturersaid‘It’stimeyoutheliteraturereview.’a.beganc.shouldbeginb.begind.arebeginning15.Afterstudyingourexperimentalresults,thetutorsuggestedtheexperiment.a.ustorepeatc.werepeatb.thatwetorepeatd.metorepeat16.Afteryourresultsyoushouldmakeanappointmentwithyourtutor.a.youreceivingc.youhavereceivedb.youwouldhavereceivedd.youreceived17.Youtheexperimenttwice,notonce.a.shouldhavecarriedoutc.haven’tcarriedoutb.shouldn’thavecarriedoutd.couldn’thavecarriedout18.Itlooksyou’vemadeamistake.a.asc.ifb.asthoughd.perhaps19.Afterreceivingherresults,thestudentstopped.a.toworryc.worryingb.havingworriedd.tobeworried20.Youincludethissection.Itisnotnecessarya.mustc.don’tneedb.couldn’td.don’thaveto21.Unlessanextensionatleastoneweekbeforetheduedate,itwillnotbegiven.a.yourequestc.yourequestedb.youwillrequestd.requesting22.Theassignmentmademe.a.tothinkhardc.thinkhardb.thinkinghardd.thoughthard23.Thescientistswereprohibitedthedangerzone.a.toenterc.enterb.enteringd.fromentering24.therightanswerIwouldhavegotfullmarks.a.HadIknownc.IfI’llknowb.ifIwouldhaveknownd.IfIwasknowing25.Theresultswereconvincingthatwedecidedtopublishthem.a.soc.veryb.suchd.somuch26.wayyoudoit,theanswerisalwaysthesame.a.Howeverc.Whoeverb.whicheverd.Whyever27.producingmethane,theprocessalsoproducescarbonmonoxide.a.Apartc.Besidesb.Aswelld.Inaddition28.Thebiologistadmittedexcessivenumbersofanimalsinlaboratorytests.a.usingc.beingusedb.toused.used29.Awhaleisamammal,itiswarm-bloodedandgivesmilktoitsyoung.a.whoc.whichmeansthatb.whichd.that30.Heappearsminorproblems.a.tohavehadc.washavingb.havingd.hadGrammarPracticeAnswer1.C11.B21.a2.d12.D22.c3.B13.B23.d4.A14.A24.a5.C15.C25.a6.A16.C26.b7.C17.A27.c8.C18.B28.a9.D19.C29.c10.B20.D30.a