阅读理解.Riversareoneofourmostimportantnaturalresources(自然资源).Manyoftheworld'sgreatcitiesarelocatedonrivers,andalmosteverycountryhasatleastoneriverflowingthrough.Thatplaysanimportantpartintheli

　　阅读理解. Riversareoneofourmostimportantnaturalresources(自然资源).Manyoftheworld'sgreatcities

　　arelocatedonrivers,andalmosteverycountryhasatleastoneriverflowingthrough.Thatplaysan

　　importantpartinthelivesofitspeople.

　　Sincethebeginningofhistory,peoplehaveusedriversfortransportation.Thelongestoneinthe

　　UnitedStatesistheMississippi.ThelifelineofEgyptisNile.TothepeopleofIndia,theGangesisgreat,

　　butitisalsoimportantfortransportation;shipscantravelalongitforathousandmiles.Othergreatrivers

　　aretheCongoinAfricaandtheMekonginSoutheastAsia.Thegreatestofallfornavigation(航海),

　　however,istheAmazoninBrazil.Itissowideandsodeepthatlargeshipscangoabouttwothousand

　　milesuponit.

　　Besidestransportation,riversgivefoodtoeat,watertodrink,waterforcrops,andchancesforfun

　　andrecreationforthepeoplewholivealongtheirbanks.Inordertoincreasethesupplyofwaterforcrops,

　　engineerssometimesbuildadam(大坝)acrossariverandletalakeformbehindthedam.Thenpeople

　　canusethewaternotonlytoirrigate(灌溉)theirfieldsbutalsotomakeelectricityfortheirhomesand

　　industries.However,largecitiesandindustriesthatarelocateduponriversoftenmakeproblems.Asthe

　　citiesgrowinsizeandindustriesincreaseinnumber,thewaterintheriversbecomespollutedwith

　　chemicalsandothermaterials.Peoplearelearningtheimportance,however,ofdoingmoretokeeptheir

　　riverscleaniftheywanttoenjoythebenefits(利益)ofthisnaturalresource.1.Thegreatestriverfornavigationis .[ ]A.theAmazon

　　B.theNile

　　C.theMekong

　　D.theMississippi2.WhichofthefollowingisWRONGaccordingtothepassage?[ ]A.TheNileisinIndia.

　　B.Almosteverycountryhasatleastoneimportantriver.

　　C.Manycitiesarelocatedonrivers.

　　D.Riversplayanimportant