新编英美概况许鲁之(第四版)Unit1-7课后习题简答题答案解析.doc

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

2、heAppalachianMountainsthatbegininCanadaandreachallthewaytoGeorgiaandAlabama.Theseareoldmountainswithroundedtopsandwoodedhills,usuallynotexceeding800minheight.Thehighestpointisonly2000mabovethesea.Mostofthemountainridgesarelowenoughtobeeasilycrossedbymodernhighways.TheAppa

3、lachianshavemuchbeautifulsceneryandmanytouristresorts.TheOhioandtheTennesseeRiversflowdownthewesternslopesoftheAppalachianstothegreatMississippiRiver,deepintheheartofAmerica.2)TothewestoftheGreatPlainslietheRockyMountains,“thebackboneofthecontinent”.Thesehighmountainsstre

4、tchallthewayfromMexicototheArcticandformwhatisknownasContinentalDivide,orGreatDivide,themostimportantwatershedonthecontinent.TheRockiesaremorethantwiceashighastheAppalachiansandhighenoughtoreceivemorerainthanthesurroundingplainsandplateaus.Consequently,theyaremostlyforest

5、ed.ThestrikingandvariedsceneryoftheRockieshasgivenrisetotheestablishmentofmanynationalparkshere.Theothernaturalwondersincluderoamingherdsofbuffalo,elk,deer,antelopeandsheep,aswellasthefamousgrizzlybear.Chapter2AmericanPopulation1.WhyistheUnitedStatesknownasa“meltingpot”?I

6、tmeansthattheUSiscomposedofimmigrantsfromdifferentnationsallovertheworld.①ThepeopleoftheUSarepredominantlywhite.②ThesecondmostnumerousminorityintheUSweretheblackpeoplewhoseforefatherscamefromAfrica.③AmericanIndiansweretheoriginalinhabitantsonthecontinent.④Therewereabout50

7、.5millionHispanicsin2010intheUS.TheyaretheSpanish-speakingimmigrantsfromLatinAmericancountries.⑤TheChineseAmericanhaveprovedtobeindustriousandintelligent.2.WhatfactorscausetheAmericanstomovefrequentlywithintheUnitedStates?①Thedesireforeconomicbettermentisgenerallythemosti

8、mportantforceinducingmigration.②Geographicdifferenceineconomicopportunity,asreflectedbysuchfacto