新编英美概况 许鲁之(第四版)unit1-12课后习题选择填空

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1、Chapter1GeographicalFeaturesandNaturalResources1.Inarea,theUnitedStatesisthe4thlargestcountryintheworld.2.TheMidwestintheUSreferstotheregionaroundtheGreatLakesandtheupperMississippiValley.3.TheBackboneofNorthAmericareferstotheRockyMountains4.DeathValleyisonthe

2、westernedgeoftheGreatBasin.5.TheGreatPlainsmighthaveaduststorminsummer.6.ThewesternpartofWashingtonStatehasthehighestrainfallintheUS.7.TheUSprimarysuppliersofforeignoilarethefollowingcountriesexceptJapan8.TheUSlargestopen-pitcopper-miningcenterisinUtah.1.TheUn

3、itedStatesisborderedonthenorthbyCanada,onthesouthbyMexicoandtheGuffofMexico,ontheeastbytheAtlanticOcean,andonthewestbythePacificOcean.2.ThelargeterritoryofthecontinentalUSisdividedintothreebasicareas:A.theAtlanticseacoastwesttotheAppalachiansB.theMississippiRi

4、verBasinC.theRockieswesttothePacific3.TheMiddleAtlanticStatesarethemostdenselypopulatedregionintheUS,wherethelandisflatandfertile.4.TheCentralValleyofCaliforniaisahighlyproductivearea,whichproducedenormousamountsoffruitsandvegetables.5.Mostproductionofoilandna

5、turalgasintheUScomesfromoffshoreareasofLouisianaandTexas,andfromonshoreareasofTexas,OklahomaandCalifornia.HerbigconsumptionofenergynowhasmadeAmericainsufficientinoilsupply.TheUSrelianceofforeignoilhasremindedconsistentlyinthe40%ranges.6.TheUnitedStateshaslittl

6、etroublecausedbytheshortageoffreshwater.FarmlandsintheUSmakingupabout12%ofthearablelandsintheworld,andtheyareamongtherichestandmostproductive.Chapter2AmericanPopulation1.Theover3millionofearlyAmericansin1790weremostlyofBritishancestry.2.About700,000immigrantsw

7、erelegallyreceivedbytheUSeachyearduringthe1980s.3.TheofficialracialsegregationcontinuedtobethelawoftheUSuntil1954.4.AmericanIndiansnowmainlyliveintheSouth.5.ThemajorityofAmericanHispanicsarefromthefollowingcountriesexceptSpain.6.TheWestnowleadsinpercentageincr

8、easeinpopulation.7.Accordingtothe1994UScensus,thesecondmostpopulousstateintheUSisTaxes.8.ThetrendinmigrationfromcitiestosuburbsnowprevailedinallregionsexcepttheSouth.1.TheUnitedSta