语篇理解   Thelastpartofthiscenturywillbeanageofexploration（探险）suchasmanhasneverknown．Thereare9planets,atleast30moons,andthousandsofasteroids（小行星）．Theirtotalareaisabout250timesthatoftheearth．Spaceshipswillnotbeabletolandonsomeofthem．Butthatstillleavestobeexploredanarea10timesasgreatasthecontinentsoftheearth．　　Exploringspacemayseemterrifyingtosomepeople．Nodoubt（毫无疑问）explorersofthepastwereterrifiedbytheemptyoceansthatlaybeforethem．Theyconquered（征服）theirfears,crossedtheoceans,andbuilttheNewWorld．　　Inthepastwhenexplorerssetsailintotheunknown,theyhadtosaygood-byetoeverythingtheyknewathome．Spaceexplorerswillnotfacesuchgreatloneliness．Evenwhentheytravelfarbeyondthesun,theywillbeabletosendmessagesback．1．Accordingtothefirstparagraph,______．[　　]A．manhasnotknownhowtoexplorespaceyetB．spaceshipswillbeabletoreachsomeplacesinspaceC．anareatobeexploredifaslargeasthecontinentsoftheearthD．thetotalareatobeexploredifabout250timesthatoftheearth2．Futureexplorationwill______．[　　]A．bemoredifficultthanitwasinthepastB．coveralargerareathananyexploringdonebeforeC．bemoredangerousthaninthepast

D．bemorelonelythaninthepast

3．Ifthelandareaoftheearthisabout55×106squaremiles,the

 areathatcanbeexploredinspaceisprobably______squaremiles.

A．495×106　　 B．165×107

C．55×107　　  D．1375×107

4．Nowspaceexplorerswillnotfeellonelybecause______.

A．theyaresoexcitedthattheyforgeteverythingathome

B．theyhavealreadysaidgood-byetoeverybodytheyknow

C．theyhavebeenabletoconquerfearsandlonelinessD．theykeepintouchwiththeearthatanytime

5．Thewriterthinksthatalltheareasthatcanbeexploredaretobeexplored______.

A．attheendofthenineteenthcentury

B．attheendofthenextcentury

C．attheendofthetwentiethcenturyD．inthefar-distantfuture

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