【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.
【简答题】选择动词词组,并用其适当形式填空。 go to sleep, learning…by themselves, used up, come ture, be angry with 1.Sometimes,I would my best friend,but not for long. 2.Tom,it’s time for you to or you will get up late tomorro...