a rainforest is an area covered by tall trees with the total high rainfall spreading 阅读理解答案

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1、Arainforestisanareacoveredbytalltreeswiththetotalhighrainfallspreading阅读理解答案　　Arainforestisanareacoveredbytalltreeswiththetotalhighrainfallspreadingquiteequallythroughtheyearandthetemperaturerarelydippingbelowl6℃.Rainforestshaveagreateffectontheworld

2、environmentbecausetheycantakeinheatfromthesunandadjusttheclimate.Withouttheforestcover，theseareaswouldreflectmoreheatintotheatmosphere，warmingtherestoftheworld.Losingtherainforestsmayalsoinfluencewindandrainfallpatterns，potentiallycausingcertainnatur

3、aldisastersallovertheworld.　　Inthepasthundredyears，humanshavebegundestroyingrainforestsinsearchofthreemajorresources（资源）：landforcrops，woodforpaperandotherproducts，landforraisingfarmanimals.Thisactionaffectstheenvironmentasawhole.Forexample，alotofcarb

4、ondioxide（二氧化碳）intheaircomesfromburningtherainforests.Peopleobviouslyhaveaneedfortheresourceswegainfromcuttingtreesbutwewillsuffermuchmorethanwewillbenefit.　　Therearetwomainreasonsforthis.Firstly，whenpeoplecutdowntrees，generallytheycanonlyusethelandf

5、orayearortwo.Secondly，cuttinglargesectionsofrainforestsmayprovideagoodsupplyofwoodrightnow，butinthelongrunitactuallyreducestheworld’swoodsupply.　　Rainforestsareoftencalledtheworld’sdrugstore.Morethan25％ofthemedicinesweusetodaycomefromplantsinrainfore

6、sts.However，fewerthanl％ofrainforestplantshavebeenexaminedfortheirmedicalvalue.Itisextremelylikelythatourbestchancetocurediseasesliessomewhereintheworld’sshrinkingrainforests.　　21.Whatdoestheword“this”underlinedinthethirdparagraphreferto?　　A.Wewilllos

7、emuchmorethanwecangain.　　B.Humanshavebegundestroyingrainforests.　　C.Peoplehaveastrongdesireforresources.　　D.Muchcarbondioxidecomesfromburningrainforests.　　22.Itcanbeinferredfromthetextthat　　A.wecangetenoughresourceswithoutrainforests　　B.thereisgreatm

8、edicinepotentialinrainforests　　C.wewillgrowfewerkindsofcropsinthegainedland　　D.thelevelofannualrainfallaffectswindpatterns　　23.Whatmightbethebesttitleforthetext?　　A.HowtoSaveRainforests　　B.HowtoProtectNature　　C.RainforestsandtheEnvironment　　D.Rainfor