英语翻译

Onarainyday,youwillseemanystreamsofmuddywaterrunningdowntheslopes(斜坡)ofahill.Thewaterismuddybecauseitwashesawaysoilfromthehillslopes.Sometimessoilisblownawaybystrongwinds.Whenthesoiliscarriedawaybywaterorwind,wesaythatthelandiseroded(侵蚀).Thisisknownassoilerosion.Plantscannotgrowonerodedland.Thereisnotenoughsoilonerodedlandtogivethemthethingstheyneed.Plantedneedwaterandsaltfromthesoil.Wecandoanumberofthingstostopsoilerosion.Thisiscalledsoilconservation.Onewayofsoilconservationonflat,opengroundistogrowsmallplantssuchasgrasses.Thererootsholdthesoiltightlytogether.Anotherwayistoplanttreesaroundanopenfield.Thussoilerosionbystrongwindscannottakeplace.Rowsoftreesactasaverybigwall.Soilerosiononslopescanbestoppedbycutting“steps”calledterraces(梯田).Watercarryingsoilcannotgostraightdowntheslopenow.Ithastorundowntheterraces.Thisslowsdowntheflowofthewater.Mostofthesoilinthewaterisleftbehindontheterraces.Thereareotherwaysforsoilconservation.

1.Thesoilcanbedestroyedby

A.strongwindB.heavyrainC.snowD.bothAandB

2.Whenplantsgrow,theyneed

A.sandandsoilB.waterandsoilC.waterandsaltsD.rain

3.Themethodofsoilconservationis

A.togrowgrassesB.toplanttreesC.tocut"steps"calledterracesD.A.BandC

4.Themainideaofthisarticleis

A.howtoprotectthesoilB.howtogrowgrass

C.whyarethetreesplantsD.howtomaketerraces