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    题干: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.
    题目:(4)            
  • A 、regular
  • B 、formal
  • C 、continual
  • D 、circular

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参考答案

【正确答案:A】

文意:生物钟是与白昼和黑夜的循环相适应的,当在一个新的时区里生物钟在所谓错误时间经历白昼或黑夜时,就会失衡。从常识可知,昼夜更迭是有规律的,这种规律性循环往复,因此a regular rhythm of daylight and darkness(白昼与黑夜有规律地循环)是通顺的。选项A. regular是答案。

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