新编英美概况 许鲁之(第四版)unit1-7课后习题简答题答案

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1、Unit1GeographicalFeaturesandNaturalResources1.HowmanystatesarethereintheUnitedStates?Andwhichtwostatesaregeographicallyseparatedfromtheothers?(50,Alaska,Hawaii)2.WhatarethegeneralcharactersoftheRockyMountainsandtheAppalachianMountains.1)TothewestofAtlanticcoastalplainlietheAppalachi

2、anMountainsthatbegininCanadaandreachallthewaytoGeorgiaandAlabama.Theseareoldmountainswithroundedtopsandwoodedhills,usuallynotexceeding800minheight.Thehighestpointisonly2000mabovethesea.Mostofthemountainridgesarelowenoughtobeeasilycrossedbymodernhighways.TheAppalachianshavemuchbeauti

3、fulsceneryandmanytouristresorts.TheOhioandtheTennesseeRiversflowdownthewesternslopesoftheAppalachianstothegreatMississippiRiver,deepintheheartofAmerica.2)TothewestoftheGreatPlainslietheRockyMountains,“thebackboneofthecontinent”.ThesehighmountainsstretchallthewayfromMexicototheArctic

4、andformwhatisknownasContinentalDivide,orGreatDivide,themostimportantwatershedonthecontinent.TheRockiesaremorethantwiceashighastheAppalachiansandhighenoughtoreceivemorerainthanthesurroundingplainsandplateaus.Consequently,theyaremostlyforested.ThestrikingandvariedsceneryoftheRockiesha

5、sgivenrisetotheestablishmentofmanynationalparkshere.Theothernaturalwondersincluderoamingherdsofbuffalo,elk,deer,antelopeandsheep,aswellasthefamousgrizzlybear.Chapter2AmericanPopulation1.WhyistheUnitedStatesknownasa“meltingpot”?ItmeansthattheUSiscomposedofimmigrantsfromdifferentnatio

6、nsallovertheworld.①ThepeopleoftheUSarepredominantlywhite.②ThesecondmostnumerousminorityintheUSweretheblackpeoplewhoseforefatherscamefromAfrica.③AmericanIndiansweretheoriginalinhabitantsonthecontinent.④Therewereabout50.5millionHispanicsin2010intheUS.TheyaretheSpanish-speakingimmigran

7、tsfromLatinAmericancountries.⑤TheChineseAmericanhaveprovedtobeindustriousandintelligent.2.WhatfactorscausetheAmericanstomovefrequentlywithintheUnitedStates?①Thedesireforeconomicbettermentisgenerallythemostimportantforceinducingmigration.②Geographicdifferenceineconomicopportunity,asr

8、eflectedbysuchfacto