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专升本英语模拟试题（七）
模拟试题（七）
PartIReadingComprehension(40%35minutes)
Directions:Inthisparttherearefourpassages.Eachpassageisfollowedbyanumberofcomprehensionquestions.Readthepassageandchoosethebestanswertoeachquestion.Then,markyouranswerbyblackeningthecorrespondingletterontheAnswerSheet.
Questions1to5arebasedonthefollowingpassage:
Supposewebuiltarobot(机器人)toexploretheplanetMars.Weprovidetherobotwithseeingdetectors(探测器)tokeepitawayfromdanger.Itispoweredentirelybythesun.Shouldweprogramtherobottobeequallyactiveatalltimes?No.Therobotwouldbeusingupenergyatatimewhenitwasnotreceivingany.Sowewouldprobablyprogramittostopitsactivityatnightandtowakeupatdawnthenextmorning.
Accordingtotheevolutionary(进化的)theoryofsleep,evolutionequippeduswitharegularpatternofsleepingandwakingforthesamereason.Thetheorydoesnotdeny(否认)thatsleepprovidessomeimportantrestorativefunctions(恢复功能).Itmerelysaysthatevolutionhasprogrammedustoperformthosefunctionsatatimewhenactivitywouldbeinefficientandpossiblydangerous.However,sleepprotectsusonlyfromthesortoftroublewemightwalkinto;itdoesnotprotectusfromtroublethatcomesloo kingforus.Sowesleepwellwhenweareinafamiliar,safeplace,butwesleeplightly,ifatall,whenwefearthatbearswillnoseintothetent.
Theevolutionarytheoryexplainsthedifferencesinsleepamongcreatures.Whydocats,forinstance,sleepsomuch,whilehorsessleepsolittle?Surelycatsdonotneedfivetimesasmuchrepairandrestorationashorsesdo.Butcatscanaffordtohavelongperiodsofinactivitybecausetheyspendlittletimeeatingandareunlikelytobeattackedwhiletheysleep.Horsesmustspendalmostalltheirwakinghourseating,becausewhattheyeatisverylowinenergy＆#118alue.Moreover,theycannotaffordtosleeptoolongorto
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