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1、課時(shí)作業(yè)課時(shí)作業(yè)(三十三三十三)[選修選修7UnitUnit3UnderUnderthethesea]sea](限時(shí)：30分鐘)Ⅰ.Ⅰ.完形填空AcoupleofyearsagowhenmysonwasjustlearningtowalkIfoundmyselfatthelocalSundaybootfair.MysonIwere__1__updownthefieldwhenwesawatablethathadsometoycarson

2、.Isaidtomylittleboythatsincehehadbeensuchagoodboyhecould__2__oneofthe50pcarsIwouldbuyitfhim.AftersometimehechoseacaritwasonlywhenIwentto__3__thatIrealizedthatIhad46pa￡10note.I__4__topaywiththe￡10theladyaskedifIhadanythin

3、g__5__.Itippedoutthe46pintomy__6__saidthatitwasallthechangethatIhad.TheladyatthestallonlygavemeaglanceasIhelditouttoherwithanapologeticlookonmyfaceshookherhead__7__totalktoanothercustomer.Iwasshockedather__8__.Withasinki

4、ngheartI__9__tomyboystartedtotrytoexplaintohim.__10__，heburstintofloodsoftears.Justashehadcalmeddownhadtakenmyhtowalkoffanelderlylady__11__myarm.Shesaid“ExcusemeIcouldntbelievehowrudethatladywastoyouyoursonsawhow__12__yo

5、ursonwaswhenyousaidthathecouldnthavethecarhehadchosensoI__13__itfhim.”Myson__14__stoppedcryingsmiledatherasshehedhimthecar.IwasspeechlessburstintotearsasIwas__15__bythisstrangerskindness.Icouldntthankherenough.Althoughth

6、ecaronlycost50ptohertheunexpectedkindnessthoughtfulnessofthisstrangerstillcontinuestoaffectmylifemyactionstoday.1A.weringBrunningCdrivingDlying2A.tryBcleanCchooseDmake3A.restBmendCsignDpay4A.triedBmanagedCagreedDused5A.l

7、argerBsmallerCnicerDsmarter6A.drawerBpocketChDwallet7A.hadBcontinuedtoseacreaturesAThesoundofcars.BThesoundofvoices.CManmadenoisepollution.DThesoundofsteps.17AccdingtothepassagenaturalsoundsincludeallofthefollowingEXCEPT

8、________AsoundsmadebyanimalsthemselvesBoceandrillingCunderwaterearthquakesDthebreakingoficefields18WhichofthefollowingisdiscussedinthethirdparagraphAThesamenoiselevelproducesadifferenteffectonlintheocean.BDifferentplaces

9、mayhavedifferenttypesofnoises.CThedecibelisnotasuitableunitfmeasuringunderwaternoise.DDifferentoceananimalsmayhavedifferentreactionstonoises.19WhichofthefollowingistrueofwhalesATheywontbeconfusedbynoises.BTheyaredeaftono

10、ises.CTheirabilitytoreproducewillbeloweredbyhighlevelnoises.DTheirhearingwillbedamagedbyhighlevelnoises.20AccdingtothepassagewhatwillscientistsmostprobablydointhefutureATheywillwkhardtoreduceoceannoisepollution.BTheywill

11、protectanimalsfromharmfulnoises.CTheywilltrytosetalimitof120decibels.DTheywillstudytheeffectofoceannoisepollution.BTheseahasalwaysinterestedman.Fromitwecangetfoodmineralstreasure.Fthoussofyearswecouldsailonit.Butwecouldn

12、otgofarbeneathitssurface.Manwantstoexpledeepintothesea.However，wearenotfish.Wemustbreatheairsowecantstayunderthewaterssurfacefanylengthoftime.Toexpledeepwatermanfacesevenmedangersproblems.Adiverwhowantstostayunderwaterfm

13、ethanafewminutesmustbreatheairaspecialmixtureofgases.Hecanwearadivingsuithaveairpumpedtohimfromabove.Hecancarryatankofaironhisbackbreathethroughanoseamouthpiece.Waterweighs800timesasmuchasair.Tonsofwaterpushesagainstadiv

14、erdeepinthesea.Hisbodyisundergreatpressure.Whenadiverisundergreatpressurehisbloodtakesinsomeofthegaseshebreathes.Asherisestosurfacethewaterpressurebecomesless.Ifthediverrisestooquicklythegasesinhisbloodfmbubbles.Thediver

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