托福考试模拟预测练习题

本文格式为Word版，下载可任意编辑——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。以下是我为大家探寻整理的最新托福考试模拟预料练习题，梦想能给大家带来扶助!更多精彩内容请实时关注我们我!

Themineralparticlesfoundinsoilrangeinsizefrommicroscopicclayparticlestolargeboulders.Themostabundantparticlessand,silt,andclayarethefocusofexaminationinstudiesofsoiltexture.Textureisthetermusedtodescribethecompositesizesofparticlesinasoilsample,typicallyseveralrepresentativehandfuls.

Tomeasuresoiltexture,thesand,silt,andclayparticlesaresortedoutbysizeandweight.Theweightsofeachsizearethenexpressedasapercentageofthesampleweight.Inthefield,soiltexturecanbeestimatedbyextractingahandfulofsoilandsqueezingthedampsoilintothreebasicshapes;1cast,alumpformedbysqueezingasampleinaclenchedfist;2thread,apencilshapeformedbyrollingsoilbetweenthepalms;and3ribbon,aflatfishshapeformedbysqueezingasmallsamplebetweenthethumbandindexfinger.Thebehavioralcharacteristicsofthesoilwhenmoldedintoeachoftheseshapes,iftheycanbeformedatall,providethebasisforageneraltexturalclassification.Thebehaviorofthesoilinthehandtestisdeterminedbytheamountofclayinthesample.Clayparticlesarehighlycohesive,andwhendampened,behaveasaplastic.Thereforethehighertheclaycontentinasample,themorerefinedanddurabletheshapesintowhichitcanbemolded.

Anothermethodofdeterminingsoiltextureinvolvestheuseofdevicescalledsedimentsieves,screensbuiltwithaspecifiedmeshsize.Whenthesoilisfilteredthroughagroupofsieves,eachwithadifferentmeshsize,theparticlesbecomegroupedincorrespondingsizecategories.Eachcategorycanbeweighedtomakeatexturaldetermination.Althoughsievesworkwellforsilt,sand,andlargerparticles,theyarenotappropriateforclayparticles.Clayisfartoosmalltosieveaccurately;therefore,insoilswithahighproportionofclay,thefineparticlesaremeasuredonthebasisoftheirsettlingvelocitywhensuspendedinwater.Sinceclayssettlesoslowly,theyareeasilysegregatedfromsandandsilt.Thewatercanbedrawnoffandevaporated,leavingaresidueofclay,whichcanbeweighed.

1.Whatdoesthepassagemainlydiscuss?

ACharacteristicsofhighqualitysoil

BParticlestypicallyfoundinmostsoils

CHowahighclaycontentaffectsthetextureofsoil

DWaystodeterminethetextureofsoil

2.Theauthormentionsseveralrepresentativehandfulsinline4inordertoshow

Atherangeofsoilsamples

Btheprocessbywhichsoilisweighed

Ctherequirementsforanadequatesoilsample

Dhowsmallsoilparticlesareweighted

3.Thephrasesortedoutinline5isclosestinmeaningto

Amixed

Breplaced

Ccarried

Dseparated

4.Itcanbeinferredthatthenamesofthethreebasicshapesmentionedinparagraph2reflect

Athewaythesoilisextracted

Btheresultsofsqueezingthesoil

Ctheneedtocheckmorethanonehandful

Dthedifficultyofformingdifferentshapes

5.Theworddampenedinline14isclosestinmeaningto

Adamaged

Bstretched

Cmoistened

Dexamined

6.Whichofthefollowingcanbeinferredfromthepassageaboutasoilsamplewithlittleornoclayinit?

AItisnotveryheavy.

BItmaynotholditsshapewhenmolded.

CItsshapeisdurable

DItstexturecannotbeclassified

7.Thewordtheyinline21refersto

Acategories

Bsieves筛子

Clargerparticles

Dclayparticles颗粒

8.Itcanbeinferredfromthepassagethatthesedimentsievehasanadvantageoverthehandtestindeterminingsoiltexturebecause

Ausingthesievetakeslesstime

Bthesievecanmeasureclay

Clesstrainingisrequiredtousethesieve

Dthesieveallowsforamoreexactmeasure

9.Duringtheproceduredescribedinparagraph3,whenclayparticlesareplacedintowaterthey

Asticktothesidesofthewatercontainer

Btakesometimetosinktothebottom

Cseparateintodifferentsizes

Ddissolvequickly

10.Thewordfineinline24isclosestinmeaningto

Atiny颗粒微小的

Bmany

Cexcellent

Dvarious

11.AllofthefollowingwordsaredefinedinthepassageEXCEPT

Atextureline3

Bribbonline10

Csedimentsievesline18

Devaporatedline25

DADBCBBDBAD

词汇补充：

ambidextrous两手都善用的

ameliorate改善

amethyst紫晶

aminacid氨苦酸