托福考试模拟预测练习题

最新托福考试模拟预测练习题长风破浪会有时，直挂云帆济沧海。以下是为大家搜索整理的最新托福考试模拟预测练习题，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网！Themineralparticlesfoundinsoilrangeinsizefrommicroscopicclayparticlestolargeboulders.Themostabundantparticles—sand,silt,andclay—arethefocusofexaminationinstudiesofsoiltexture.Textureisthetermusedtodescribethepositesizesofparticlesinasoilsample,typicallyseveralrepresentativehandfuls.Tomeasuresoiltexture,thesand,silt,andclayparticlesaresortedoutbysizeandweight.Theweightsofeachsizearethenexpressedasapercentageofthesampleweight.lnthefield,soiltexturecanbeestimatedbyextractingahandfulofsoilandsqueezingthedampsoilintothreebasicshapes;(l)cast,alumpformedbysqueezingasampleinaclenchedfist;(2)thread,apencilshapeformedbyrollingsoilbetweenthepalms;and(3)ribbon,aflatfishshapeformedbysqueezingasmallsamplebetweenthethumbandindexfinger.Thebehavioralcharacteristicsofthesoilwhenmoldedintoeachoftheseshapes,iftheycanbeformedatall,providethebasisforageneraltexturalclassification.Thebehaviorofthesoilinthehandtestisdeterminedbytheamountofclayinthesample.Clayparticlesarehighlycohesive,andwhendampened,behaveasaplastic.Thereforethehighertheclaycontentinasample,themorerefinedanddurabletheshapesintowhichitcanbemolded.Anothermethodofdeterminingsoiltextureinvolvestheuseofdevicescalledsedimentsieves,screensbuiltwithaspecifiedmeshsize.Whenthesoilisfilteredthroughagroupofsieves,eachwithadifferentmeshsize,theparticlesbeegroupedincorrespondingsizecategories.Eachcategorycanbeweighedtomakeatexturaldetermination.Althoughsievesworkwellforsilt,sand,andlargerpartides,theyarenotappropriateforclayparticles.Clayisfartoosmalltosieveaccurately;therefore,insoilswithahighproportionofclay,thefineparticlesaremeasuredonthebasisoftheirsettlingvelocitywhensuspendedinwater.Sinceclayssettlesoslowly,theyareeasilysegregatedfromsandandsilt.Thewatercanbedrawnoffandevaporated,leavingaresidueofclay,whichcanbeweighed.l.Whatdoesthepassagemainlydiscuss?(A)Characteristicsofhighqualitysoil(B)Particlestypicallyfoundinmostsoils(C)Howahighclaycontentaffectsthetextureofsoil(D)Waystodeterminethetextureofsoil2.Theauthormentions,,severalrepresentativehandfuls"inline4inordertoshow(A)therangeofsoilsamples(B)theprocessbywhichsoilisweighed(C)therequirementsforanadequatesoilsample(D)howsmallsoilparticlesareweighted3.Thephrase,,sortedout"inline5isclosestinmeaningto(A)mixed(B)replaced(C)carried(D)separated4.ltcanbeinferredthatthenamesofthethreebasicshapesmentionedinparagraph2reflect(A)thewaythesoilisextracted(B)theresultsofsqueezingthesoil(C)theneedtocheckmorethanonehandful(D)thedifficultyofformingdifferentshapes5.Theword"dampened,,inlinel4isclosestinmeaningto(A)damaged(B)stretched(C)moistened(D)examined6.Whichofthefollowingcanbeinferredfromthepassageaboutasoilsamplewithlittleornoclayinit?(A)ltisnotveryheavy.(B)ltmaynotholditsshapewhenmolded.(C)ltsshapeisdurable(D)ltstexturecannotbeclassified7.Theword,,they,,inline21refersto(A)categories(B)sieves筛子(C)largerparticles(D)clayparticles颗粒8.ltcanbeinferredfromthepassagethatthesedimentsievehasanadvantageoverthehandtestindeterminingsoiltexturebecause(A)usingthesievetakeslesstime(B)thesievecanmeasureclay(C)lesstrainingisrequiredtousethesieve(D)thesieveallowsforamoreexactmeasure9.Duringtheproceduredescribedinparagraph3,whenclayparticlesareplacedintowaterthey(A)sticktothesideso代hewatercontainer(B)takesometimetosinktothebottom(C)separateintodifferentsizes(D)dissolvequickly10.Theword,,fine,,inline24isclosestinmeaningto(A)tiny颗粒微小的(B)many(C)excellent(D)variousll.AllofthefollowingwordsaredefinedinthepassageEXCEPT(A)texture(line3)(B)ribbon(linelO)(C)sedimentsieves(linel8)(D)evaporated(line25)DADBCBBDBAD词汇补充：ambidextrous两手都