新编英美概况 许鲁之(第四版)unit1-7课后习题简答题答案

《新编英美概况 许鲁之(第四版)unit1-7课后习题简答题答案》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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

2、achianMountainsthatbegininCanadaandreachallthewaytoGeorgiaandAlabama.Theseareoldmountainswithroundedtopsandwoodedhills,usuallynotexceeding800minheight.Thehighestpointisonly2000mabovethesea.Mostofthemountainridgesarelowenoughtobeeasilycrossedbymodernhighways.TheAppalachianshavemu

3、chbeautifulsceneryandmanytouristresorts.TheOhioandtheTennesseeRiversflowdownthewesternslopesoftheAppalachianstothegreatMississippiRiver,deepintheheartofAmerica.2)TothewestoftheGreatPlainslietheRockyMountains,“thebackboneofthecontinent”.ThesehighmountainsstretchallthewayfromMexic

4、ototheArcticandformwhatisknownasContinentalDivide,orGreatDivide,themostimportantwatershedonthecontinent.TheRockiesaremorethantwiceashighastheAppalachiansandhighenoughtoreceivemorerainthanthesurroundingplainsandplateaus.Consequently,theyaremostlyforested.Thestrikingandvariedscene

5、ryoftheRockieshasgivenrisetotheestablishmentofmanynationalparkshere.Theothernaturalwondersincluderoamingherdsofbuffalo,elk,deer,antelopeandsheep,aswellasthefamousgrizzlybear.Chapter2AmericanPopulation1.WhyistheUnitedStatesknownasa“meltingpot”?ItmeansthattheUSiscomposedofimmigran

6、tsfromdifferentnationsallovertheworld.①ThepeopleoftheUSarepredominantlywhite.②ThesecondmostnumerousminorityintheUSweretheblackpeoplewhoseforefatherscamefromAfrica.③AmericanIndiansweretheoriginalinhabitantsonthecontinent.④Therewereabout50.5millionHispanicsin2010intheUS.Theyarethe

7、Spanish-speakingimmigrantsfromLatinAmericancountries.⑤TheChineseAmericanhaveprovedtobeindustriousandintelligent.2.WhatfactorscausetheAmericanstomovefrequentlywithintheUnitedStates?①Thedesireforeconomicbettermentisgenerallythemostimportantforceinducingmigration.②Geographicdiffere

8、nceineconomicopportunity,asreflectedbysuchfacto