阅读理解。Treesareusefultomaninthreeimportantways:theygivehimwoodandotherusefulthings,theygivehimcoolplaces,andtheyhelptostopdroughtandflood.Unluckily,inmanypartsoftheworld,manhasnotfound
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| 阅读理解。 |
| Treesareusefultomaninthreeimportantways:theygivehimwoodandotherusefulthings,theygive himcoolplaces,andtheyhelptostopdroughtandflood. Unluckily,inmanypartsoftheworld,manhasnotfoundthatthethirdofthesepointsisthemost important.Manwantstomakemoneyfromtrees,sohehascutthemdowninlargenumbers,onlytofind thatwithoutthemhehaslostthebestfriendshehad.Andalso,heisusuallytoocarelesstoplantandlook afternewtrees.Sotheforestsslowlydisappear. Thisdoesnotonlymeanthatmanwillhavefewertrees.Theresultsareevenworse:forwherethereare trees,theirrootsbreakupsoil(土壤)-maketherainin-andalsobind(粘合)thesoil,thus(这样)stoppingit frombeingwashedawayeasily;butwheretherearenotrees,therainfallsonhardgroundandflowsaway, causingfloodsandcarryingawaytherichtop-soil.Whenallthetop-soilisgone,nothingisleftbutuseless desert. |
| 1.Themostimportantpointsoftreestomanisthat________. |
| A.theyhelphimtomakemoney B.theygivehimcool C.theygivehimwoodandotherthings D.theyhelphimtostopdroughtandfloods |
| 2.Inmanyplacesforestsslowlydisappearbecause________. |
| A.manytreeshavebeencutdownbyman B.newtreesarenotwelllookedafter C.manhasnotpaidenoughattentiontoplantingtrees D.alltheabove |
| 3.Landbecomesdesertafteralltreesarecutdownbecause________. |
| A.rootsoftreesbreakupthesoil B.therearetoomanyrainfalls C.strongwindsbringalotofsand D.therearenolongertreestokeeptherainandprotectthetop-soil. |
| 4.Whichtitlebestfitsthepassage? |
| A.TreesandMan B.TheFunctionofTreeWood C.HowdoPeopledowithTrees D.TheUsageofTreeRoots |
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