Unit1寒假提前练习 高中英语人教版必修第三册文档格式.docx

Unit1寒假提前练习 高中英语人教版必修第三册文档格式.docx

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Microplasticsaretinybitsofplasticoftentoosmalltobeseen.Plasticdoesn'

tdecomposelikenaturalmaterials.Instead,itjustbreaksintosmallerandsmallerpieces.Nooneknowsexactlyhowmuchplasticisintheoceans.Sincetheseaissolargeandsodeep,itshardtogetagoodideaofhowmuchplasticitcontains.Butinrecentyears,scientistshavemadegreatereffortstogetamoreaccurateidea.

Somestudieshavesuggestedthatsince1950.about17millionmetrictons（公吨）ofplastichaveenteredtheAtlanticOcean.Scientistsbelievethattheplasticpreviouslyfoundonbeachesandonthesurfaceofthewaterisonlyabout1%ofalltheplasticintheoceans.ResearchersfromtheUnitedKingdom（UK）wanttofindoutwheretheother99%was.

Fortwomonthsin2016theresearcherstooksamplesat12differentlocationsintheAtlanticOceanfromtheUKtoSouthAmerica.Theycollectwatersamplesfromthreedifferentdepthsinthetop200meters.Byrunningthewaterthroughspecialfllters（过滤器）,theywereabletocollectthemicroplastics,whichtheycouldviewandstudywithamicroscope.

Basedontheirmeasurments.theresearcherslearnedthatjustthetop200metersoftheAtlanticOceanholdsbetween12and21millionmetrictonsofplastics.ButtheAtlanticOceanisverydeep,andthescientistsonlycheckedthetop200meters.TheysaythatifmicroplasticsarespreadthroughtherestoftheAtlanticliketheywereinthetop200meters,thintherearcprobablyabout200millionmetrictonsofmicroplasticsintheAtlanticOcean.

ThoughthescientistsonlystudiedtheAtlanticoceantheresultssuggestthattheremaybefarmoremicroplasticinalloceansthanwerealized.Theproblemsgofarbeyondoceanpollution.MicroplasticparticleshavebeenfoundjustineverywherearoundtheworldfromAntarcticatothebottomofthesea.

Scientistpredictthattheamountofplasticenteringouroceansislikelytotripletoverthenext20years.Havingagoodideaofhowmuchplasticisalreadythenmightbeagoodfirststeptofightingtheproblem.

5.Whatdocstheunderlinedword“decompose”inParagraph1mean?

A.turnupB.breakdownC.giveoffD.bringout

6.Whatisthelatestideaabouttheplasticintheseas?

A.Previousdataofplasticconsistsofonlyaverysmallpart.

B.Thereisonly17millionmetrictonofplasticontheearth.

C.Theamountofplasticintheseasisonthedecreaseinrecentyears.

D.Theamountofplasticintheseasisincreasingby1%yearly.

7.Whatistheauthor’sattitudeaccordingtothetext?

A.Pessimistic.B.Confident.C.Objective.D.Conserved.

8.Whatdoestheauthorexpecttotakeplace?

A.Morepollutantswillturnoutinthefuture.B.Measureswillbetakentodealwithplastic.

C.Theoceanswillbecleanedinthefuture.D.Morepeoplewillbeawareofplasticpollution.

二．七选五

Whileitmayseemlikeeveryonesurfsthewebthesedays,thereisfinelinebetweencasuallycheckingyoursocialmediapagesandhavingafullblownInternetaddiction.IfyoufearthatyoumayloseinterestinotheraspectsofyourlifebecauseyouprefertobeontheInternet,youmaybeonyourwaytoanInternetaddiction.___1__

Admityouareatriskofanaddiction.

MoreandmorepeopleintheworldarebecomingaddictedtotheInternet.Youarenottheonlyonewiththisproblem;

itisbecomingmoreandmorecommonandmoreandmorewellknown.___2___.

Setasidelimitedtimeforcomputeruse.

Makesurenottoturnitontoomanytimesaweek.Ifyouhavealaptop,makesuretoputitsomewherethatyoucanrememberbutnotsomewherethatyouseeeveryday.Trykeepingthelidclosedwhenyouarenotusingit;

___3___IfyouhaveadesktopPC,trynottogonearitorputsomethingoveritlikeasheet.

Callpeopleinsteadofsendinginstantmessagesortexts.

Ifyouarefreeonweekends,callfriendsandaskthemtogooutside.Thiswilldistractyoufromthecomputer.___4___

Useanalarmclockortimer.

Beforeusingyourcomputer,decideonatimelimitsuchas30minutes.Settheclockortimerandmakesurethatyougetoffthecomputerwhenthetimeisup.Alternativelycreateashutdowntimeronyourdesktop.___5___.

A.Makeasmalllistofwhatyouwanttodowithinthattime.

B.Whenthecomputerisnotlookingatyouyouarelesslikelytouseit.

C.Thiscanbeprogrammedtoshutdownyourcomputerafterthesettime

D.Luckily,therearewaystoavoidlivingyourlifeinfrontofthecomputer.

E.ThiswillstopyoufromusingtheInternetsooftenorgoingontoanotherpage.

F.Ifyouhaveaproblemonweekdays,phoneyourfriendsoraskforhelpinperson.

G.Donotbeembarrassed;

findotherswiththesameproblemandhelpeachotherbeatit.

三．语法填空

Asyouknow,scienceplays____1____veryimportantroleinoureducation.Doyouwanttok