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