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1、Unit7partA习题1.选词填空before,discover,fast,in,come,watch,so,fastit,ago,shine,notcanLighttravelsataspeed(速度)whichisaboutamilliontimes1.________thanthatofsound.2.________onesecond,lighttravelsabout300,000kilometers,butsoundtravelsonly340meters.Youcangetsomeideao
2、fthisdifferenceby3.________thestartofarunningmatch.Ifyoustandfarawayfromthestarter(发令员),youcanseesmoke4.________fromhisgun5.________thesoundreachesyourears.Thefastspeedoflightproducessomestrangefacts.Theneareststaris6.________farawaythatlightwhichyoucansee
3、fromittonightstartedtotraveltoyoufouryears7.________ataspeedofnearlytwomillionkilometerseveryminute.Thelightfromsomeoftonight’sstartedon8.________journeytowardsyouevenbeforeyouwereborn.So,ifwewanttobehonest(诚实),we9.________say,“Thestarsareshiningbrightlyto
4、night.”Wehavetosay,“Thestarslooknice.Theywere10.________fouryearsagobuttheirlighthasjustreachedourearth.”2.阅读理解HowdoIliketotravel?Manypeopleliketotravelbyplane,butIdon’tlikeitbecauseanairportisusuallyfarfromthecity.Youhavetogetthereearlyandwaitforhoursfort
5、heplanetotakeoffanditisoftenlate.youcan’topenthewindow.Youcan’tchoosethefood.Planesarefast,buttheystilltakehourstogetoutoftheairportandintothecity.Iliketravelingbytrain.Ithinktrainsaresafe.Railwaystationsareusuallyincities.Whenyouarelateforatrainyoucancatc
6、hanotherone.youcanwalkaroundinthetrainandopenthewindows.Youcanseemanyinterestingthingsonyourway.Iknowittakesalittlemoretime.Ialsolikecars.Youcanstartyourjourneywhenyouwantto,andyoudon’tneedtogettoarailwaystationorabusstop.Alsoyoucancarrymanythingswithyouin
7、acar.Butsometimestherearetoomanycarsontheroad.1.Whydomanypeopleliketotravelbyplane?A.Becauseitisfast.B.Becauseitissafe.C.Becauseyoucanwalkaroundintheplane.2.Whichisnotthegoodthingaboutthetrain?A.Itissafe.B.Ittakesalittlemoretime.C.Youcanopenthewindows.3.If
8、youwanttotakealotofthingswithyou,whatdoyoutaketogoout?A.AbusB.Acar.C.Atrain4.Whatisthebadthingaboutthecar?A.youneedn’tgotoastationB.youcanstartyourjourneywhenyouwantto.C.Therearetoomanycarsontheroad.5.Whatdoe
