【单选题】We all know that the normal human daily cycle of some 7-8 hours sleep alternating(交替) with some 16-17 hours wakefulness and that, broadly speaking, the sleep normally happens in the same period with t...
A.
Bonjer's findings are different from Brown's.
B.
sleep normally coincides with the hours of darkness.
C.
some people can change their sleeping habits easily.
D.
shift work in industry requires people to change the sleeping habits.
【单选题】根据以下材料,回答题 More Than 8 Hours' Sleep Although the dangers of too little sleep are widely known, new research suggests that people who sleep too much may also suffer the consequences. Investigators at t...