高中英语unit7theseaperiodone课时作业北师大版

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1、Unit7　TheSeaPeriodOne　Warmup&Lesson1TheSpiritofExplorersⅠ.阅读理解AUndertheworld’soceansandseasliesanattractingworldoflandsthatstretcheshundredsofkilometersineverydirection.Inthisworld，withoutthesun，therearedeepcanyons(峡谷)，greatplains，andtoweringrangesofmountains.Andthisunderwaterworldcovers70per

2、centoftheearth’ssurface.Theworld’slongestmountainrangeextends16,000kilometersundertheAtlanticOceanfromIcelandtotheAntarctic.CalledtheMidAtlanticRidge(山脊)，thisrangeofmountainscontainsanumberofhighpeaks，amongthemaretheAscensionIsland，theAzores，andIceland.Theworld’shighestmountainisfoundinthemid

3、Pacificarea.ItistheHawaiianvolcanoMaunaKea，whichis9,450metersfrombasetopeak.Thisisnearly610meterstallerthanMountEverest.Only4,221metersofMaunaKearisesabovethesurfaceofthesea.In1873theBritishsurveyshipChallengerdiscoveredthedeepesttrench(海沟)inalltheseas.NamedtheChallengerDeep，itisneartheisland

4、ofGuamandis11kilometersdeep.Sincesunlightonlyreachestoadepthofabout244meters，manyofthecreaturesofthedeepsealiveinaworldofdarkness.However，togethelpintheirsurvival，manyhavetheirownbrightlightingsystem.Foodcomestothemfromtheupperlevelsoftheoceanandtheycangetaconstantsupplyfromthewastematterthat

5、graduallymovesdownwardtowardtheoceanfloor.Theseunderseacreaturesmustremainatthevariousplacesforwhichtheyarefit.Towandertootherlevelscouldresultindeathfromimproperwaterpressure.1．Thebesttitleforthistextshouldbe.A．TheSunlessWorld8B．TheLongestMountainC．TheHighestMountainD．TheDeepestTrench答案　A解析　

6、主旨大意题。通读全文可以看出，这篇文章主要讲述的是黑暗的海底世界的一些情况。2．Theworld’slongestmountainrangeundertheocean.A．extends1,600kilometersundertheAtlanticOceanB．iscalledtheMidAtlanticRidgeC．containsfewhighpeaksD．extendsfromIcelandtotheAzores答案　B解析　细节理解题。由第二段可得出本题的答案。3．Fromthispassageweknowthat.A．thelongestandthehighestmou

7、ntainslieintheseaB．thehighestmountainliesonlandC．thelongestmountainliesonlandD．MaunaKeais4,221metershigh答案　A解析　细节理解题。由第二、三段我们知道，最长的山脉在大西洋，最高的山峰则在太平洋中部的夏威夷。据此，我们可得出本题的答案。4．Ifakindofcreaturelivesinanseaareaabout300metersfromthesurface，.A．thecre