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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：（5）
A 、retains
B 、encounters
C 、possesses
D 、experiences

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【正確答案：D】

根據(jù)文意，應(yīng)指經(jīng)歷白晝和黑夜，在四個選擇項中，D.experiences“經(jīng)歷”，符合答案要求。A. retains保留，保有；B. encounters遭遇，遇到；C. possesses擁有，不合題意。

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