一、单项选择：从各小题所给旳A、B、C、D四个选项中，选出一种最佳答案。（共20小题；每题1分，满分20分。）1．Youcan’tpasstheexam_________youstudyhard.A．ifB．becauseC．unlessD．so2．Lookout!Don’tgettooclosetothehouseroofisunderrepair.A．whoseB．whichC．ofwhichD．that3．Ifitwerenotforthefactthatshe_________sing,lwouldinvitehertotheparty.A．couldn’tB．shouldn’tC．can’tD．mightnot4．Alwaysreadthe_________onthebottlecarefullyandtaketherightamountofmedicine.A．explanationsB．instructionsC．descriptionsD．introductions5．Greenproductsarebecomingmoreandmorepopularbecausetheyareenvironmentally.A．commonB．variousC．friendlyD．changeable6．—Whathappenedtoyouthismorning?—Theteacheraskedmeformy_____whenIwaslateagain.A．meaningB．ideaC．excuseD．answer7．—Wouldyouhelpmeputawaythesethings?—_________.A．Yes,quiterightB．NevermindC．You’rewelcomeD．Withpleasure8．—Here’scoffeeandtea.Youmanyhave________.—Thanks.A．eitherB．eachC．oneD．it9．—Willyoupleasestayherefortheparty?—Sorry,I________.I’llhavetogotoanimportantmeeting.A．mustn’tB．needn’tC．can’tD．won’t10．—Whatdoestheladylooklike?—_________.A．She’sfineandwellB．She’sreallyaniceladyC．She’stallandthinD．Shelikewearingskirts11．—Areyougoingtobuyacamera?—Yes.ButtherearesomanykindsthatIcan’tdecide________tobuy.A．whatB．whichC．howD．where12．—Iheartheweatherwill_________coldforanotherweek.—Ihopenot.Ihatecoldweather.A．turnB．lastC．stayD．get13．—Whydon’tyoudoityourself?—Sorry,Idon’tthinkI’m______to.Ineedsomeone’shelp.A．possibleB．readyC．afraidD．able14．—Itriedto_________youathomeseveraltimes,butnooneansweredthephone.—Iwastravelingaroundlastthreemonths.A．touchB．reachC．receiveD．meet15．—Canyoutellme_________?—Hehasjustmovedtoanothercity.A．wheredoesheliveB．doeshelivewhereC．wherehelivesD．heliveswhere16.TheLeaguesecretaryandmonitor______askedtomakeaspeechatthemeetingheldyesterday.A.isB.wasC.areD.were17.Theexhibition,______isaboutthe60thanniversaryofthevictoryofChina'sresistancewaragainstJapaneseaggression,consistsofmanythingsreflectingthewarperiod.A.thatB.whereC.whichD.what18.—Jack！Mybikewasstol