华师网络教育2012大学英语在线作业.doc

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1、阅读理解第1题(20)分InmanystoriesonTV andinscience-fictionbooks,mentraveltofarawaystars.Theyhavequick,easyjourneys.Butsofar,menhavebeenabletoreachonlytheearth’sownmoon.Supposeamanwantedtoreachadistantstar.Evenifhetraveledhiswholelife,hewouldhavetomovefasterthanthespeedoftheli

2、ght.Nothingcanmovethatfastexceptlightitself.Strangethingshappentoanobjectwhenitmovesrapidly.Theobjectweighsmore.Anobjectmovingat86percentofthespeedoflightistwiceasheavyasitisatrest.Astickappearsshorter.Aclockrunsmoreslowly.Amanwouldnotagesofastashewouldontheearth.Ligh

3、ttravelsmorethan186,000milesasecond, orabout11millionmilesaminute.Inoneyear,lighttravelssixtrillionmiles.Thatgreatdistanceiscalledalight-year.Itisusedtomeasuredistanceinspace.ThestarclosesttooursunisAlphaCentauri.Itismorethanfourlight-yearsaway.Ifonetraveledatthespeed

4、oflight,hecouldmakearoundtriptoAlphaCentauriinnineyears.But,evenatthatspeed,hecouldnotreachAlcaid(北斗星)inthehandleoftheBigDipper.Aone-wayjourneytoAlcaidwouldtakealmost200years.1、Inthispassagethewords“closesttooursun”meansthestarBA、theearthweliveonB、AlphaCentauriC、theBi

5、gDipperD、themoon1、Aone-wayjourneytoAlcaidwouldtake_CA、aboutnineyearsB、lessthanfouryearsC、almost200yearsD、lessthan100years2、Whydowemeasurethedistanceinlight-yearsinsteadofmiles?BA、Unitsoflight-yearssoundbetter.B、Usinglight-yearsreducedthenumberoffiguresused.C、Weusedtom

6、easuredistanceinlight-yearslongago.D、Wedonotmakemistakeswhenweｕｓｅlight-years.3、Ifastonemovedatthespeedoflight,it___A____A、wouldweightwicemorethanitismotionlessB、wouldweighasmuchasitisonearthC、wouldweighlessthanitisonearthD、wouldnothaveweightatall4、Thisstoryismainlyabo

7、ut____B____A、thedistancebetweenthesunａｎｄtheotherstarsB、theproblemsoftravelingtofarawaystarsC、whathappenswhenwetravelfasterthanthespeedoflightD、thetoolweｕｓｅwhenwegotofarawaystars第2题(20)分Ifthereisanysinglefactorthatmakesforsuccessinliving,itistheabilitytoprofitbydefeat.

8、EverysuccessIknowhasbeenachievedbecausethepersonwasabletoanalyzedefeat andactuallyprofitbyitinhisnextundertaking.Confusedefe