帮我做初二的英语阅读Whydoplantsgrowinsomeplacesandnotinothers?Whydoessomelandhavesomuchgrowingonit,whileotherlandhasalmostnoplantsgrowingonitatall?Togrow,plantsneedseveralthings.Oneiswarmth.Inverycoldp

　　帮我做初二的英语阅读

　　Whydoplantsgrowinsomeplacesandnotinothers?Whydoessomelandhavesomuchgrowingonit,whileotherlandhasalmostnoplantsgrowingonitatall?

　　Togrow,plantsneedseveralthings.Oneiswarmth.Inverycoldplacesalmostnothinggrows.Plantsalsoneedwater.InverydrypartsoftheEarthonlyafewunusualplantscangrow.That'swhydrydesertseverywherearealmostnotcoveredbytreesorgrass.

　　Plantsmustalsohaveaplaceinwhichtoputdowntheirrootsandgrow.Theyfinditdifficulttogrowonhardland.Thetownisbuiltonhardland.Theplantsherehaveonlythesoilfoundbetweenthecracksofthestonestogrowin.

　　Anotherthingplantsmusthavebeforetheycangrowisfood.

　　Whatwillhappenifwetrytomakethingsgrowonthesandybeach?Afewplants,suchasbeachgrass,willgrowinsand,butmostplantswon't.Eveniftheweatheriswarmenoughandwewatertheplantseachday,manyofthemwilldiebecausethesandonthisbeachhasalmostnofoodforplants.

　　46.Accordingtothepassage,plantsneed______thingstogrowwell.

　　A.twoB.threeC.fourD.five

　　47.Whatdoestheunderlinedword"cracks"meaninthetext?

　　A.缝隙B.表面C.夹层D.底部

　　48.Fromthepassage,wecanknowitisforplantstogrowindryplaces.

　　A.easyB.difficultC.impossibleD.important

　　49.Thereasonwhymostplantscan'tgrowonthesandybeachisthat_______.

　　A.thereisn'tenoughsunlightB.thereistoomuchwater

　　C.itistoocrowdedthereD.ithaslittlefoodforplants

　　50.Thepassagecanmostprobablybefoundina______book.

　　A.scienceB.historyC.travelD.math