#2009年全国职称英语理工类阅读理解 (8) 搜索结果
Weallknowthatthenormalhumandailycycleofsome7-8hours'sleepalternatingwithsome16-17hours'wakefulnessandthat,broadlyspeaking,thesleepnormallycoincideswiththehoursofdarkness.Ourpresentconcerniswinhoweasilyandtowha
02-12Weallknowthatthenormalhumandailycycleofsome7-8hours'sleepalternatingwithsome16-17hours'wakefulnessandthat,broadlyspeaking,thesleepnormallycoincideswiththehoursofdarkness.Ourpresentconcerniswinhoweasilyandt
02-12