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  • 完形填空
    題干:Mostpeoplewhotravellongdistancescomplainofjetlag.Jetlagmakesbusinesstravelerslessproductiveandmoreprone(1)makingmistakes.Itisactuallycausedby(2)ofyour"bodyclock"—asmallclusterofbraincellsthatcontrolsthetimingofbiological(3).Thebodyclockisdesignedfora(4)rhythmofdaylightanddarkness,sothatitisthrownoutofbalancewhenit(5)daylightanddarknessatthe"wrong"timesinanewtimezone.The(6)ofjetlagoftenpersistfordays(7)theinternalbodyclockslowlyadjuststothenewtimezone.Nowanewanti-jetlagsystemis(8)thatisbasedonproven(9)pioneeringscientificresearch.Dr.MartinMooreEdehas(10)apracticalstrategytoadjustthebodyclockmuchsoonertothenewtimezone(11)controlledexposuretobrightlight.Thetimezoneshiftiseasytoaccomplishandeliminates(12)ofthediscomfortofjetlag.Asuccessfultimezoneshiftdependsonknowingtheexacttimestoeither(13)oravoidbrightlight.Exposuretolightatthewrongtimecanactuallymakejetlagworse.Theproperschedule(14)lightexposuredependsagreatdealon(15)travelplans.Dataonaspecificflightitineraryandtheindividual'ssleep(16)areusedtoproduceaTripGuidewith(17)onexactlywhentobeexposedtobrightlight.WhentheTripGuidecalls(18)brightlight,youshouldspendtimeoutdoorsifpossible.Ifitisdarkoutside,ortheweatherisbad,(19)youareonanaeroplane,youcanuseaspeciallightdevicetoprovidethenecessarylight(20)forarangeofactivitiessuchasreading,watchingTVorworking.
    題目:(11)            
  • A 、at
  • B 、through
  • C 、in
  • D 、as

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參考答案

【正確答案:B】

空格所在句子的狀語(yǔ)是一個(gè)不定式短語(yǔ)(to adjust the body clock…意思是“能夠通過(guò)對(duì)接觸亮光的時(shí)間進(jìn)行控制,使生物鐘更快地適應(yīng)新的時(shí)區(qū)”??崭裉帒?yīng)填入表示“通過(guò)某種方法”之意的介詞,B. through意為“通過(guò)”,因此是正確答案。其他選項(xiàng)都不具備這一含義。

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