阅读理解Nooneknowswhywesleepbutit’scertainthatweneedto.Peoplewhoarepreventedfromsleepingbegintosufferobviouseffectsafterafewdays-theythinklessclearlyandtheyfall
阅读理解
Nooneknowswhywesleepbutit’scertainthatweneedto.Peoplewhoarepreventedfromsleepingbegintosufferobviouseffectsafterafewdays-theythinklessclearlyandtheyfallasleepduringtheworkinghours.
Therearenorulesaboutsleep.Generallyspeakinggrown-upssleepabout7andahalfhourseachnightandprobablymorethan60percentgetbetweensevenandeighthours.Butperhapseightpercentarequitehappywith5hoursorlessandfourpercentorsofindthattheywanttenhoursormore.Ifyoufeelallrightyou’reprobablygettingenoughsleep.Theimportantthingisnottoworryhowmuchotherpeopleget-theirneedsmaybedifferent.Exercisedoesn’tseemtoincreasetheneedforsleep-officeworkersforexamplesleepforaboutaslongaspeopledoingphysicallyactivework.
Childrensleepmorethangrown-ups-perhaps14to18hourssoonafterbirthgoingdowntogrown-uplevelsbyearlyteenage(青少年).Sleeppatternsalsotend(倾向)tobedifferentintheoldpeoplewhomaysleeplessatnightthantheydidwhenyoungerfindsleepgettingmorebrokenandoftenmakeitaruletosleepduringthedaytime.
(1)
Somepeoplecan’tthinkclearlybecause________.
[]A.
theyhavebadmemory
B.
theyfeelsleepyduringtheworkinghours
C.
theydon’thaveenoughsleep
D.
theyarecertaintobekeptfromgoingtobed
(2)
Whetheryouhavegotenoughsleepisjudged(判断)by________.
[]A.
howmanyhoursyouhaveslept
B.
howmanyhoursyouneedtosleep
C.
ifyoudoexerciseandphysicalwork
D.
ifyoufe