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单选题Whichofthefollowingstatementsbestsummarizesthemainideaofpassage?a.Nuclearenergyisenvironmentallyfriendly.b.Nuclearenergyisindispensabletomankind.c.Fossilfuelscausepollutiontotheecologicalenvironment.d.Governmentsaredividedintheirenergypolicy.
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单选题{{B}}Passage Four{{/B}}
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单选题WhyhavetheAmericansdevelopedspaceshuttleaccordingtothepassage?a.Itisafirststeptoexploreouterspace.b.Itisafollow-upactionoftheApollomoonlandings.c.ItisacompromisetotheexorbitanthumanexpeditionstotheMars.d.ItisacompensationforthewishfulthinkingofhumanlandingontheMars.
单选题In early September
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单选题Thewavelengthsoflightandradiowaves,unlikehighenergygammaradiation,aremuchshorter.
单选题Thewavelengthsoflightandradiowaves,unlikehighenergygammaradiation,aremuchshorter.