高二英语Unit9 Saving the earth同步练习.doc

用心爱心专心119号编辑9高二英语Unit9Savingtheearth同步练习I.SpeakingTask1Ourearthisindanger!Directions:Herearethemajorproblemsfacingtheearth.Workwithyourpartnerandfigureoutthecausesandpossiblesolutions.ProblemsCausesSolutions1.waterpollution2.Trash/garbage3.Airpollution4.Deforestation(采伐森林)5.Desertification(沙漠化)6.Hunger7.Deadlydiseases8._____________Task2What’sthebiggestproblem?Directions:Amongtheproblemslistedabovewhichdoyouthinkisthebiggestone?Ifyoupartnerdisagreesthenyou’llhavetopersuadehim/her.Task3Polarbears’problem.Directions:Gothroughthefollowingpassageandfinishoffthetasks.Completethetextwiththephrases:A.onaverage;B.waitfor;C.livethrough;D.beforcedto;E.liveawayfrom;Whyarepolarbearsgettingthinner?Isitgoodforbearstogetthinner?Aretheygoingtodieout?Besidespolarbearswhatotheranimalsdoesthewarminguphaveeffecton?Whatarethepossiblecausesoftheclimategettingwarmer?Whatcanbedonetostopit?Polarbearsaregettingthinner.Itisnotadietanditisnotbecausethereislessfoodtocatch.Itisbecausetheworldisgettingwarmer.GiantwhitebearsthatliveinthenorthofCanadaareatthemomentimpatiently(1)icetoform.Theyneedtheicetoforma"bridge"totheirfood—seals.Sealsusually(2)landamongtheicebergs.Howeverastheclimatebecomeswarmerwinterisgettingshorterandseaiceisdecreasinginthearea.Thisismakingpolarbears'livesincreasinglydifficult.Bearsneedtoeatasmuchfoodaspossibleinthewintertomakethemselvesfatenoughto(3)fivemonthswithoutfoodinthesummerandautumn.Duringthefive-monthice-freeseasonthebears(4)fast(绝食)."Foreveryweekabearhasnotbeenhuntingfoodoniceitis10kilogramslighter"saidascientist.Theaveragetemperatureoftheregionhasrisenfrom0.3to0.4degreescentigradesince