Sleep: Jerry gets hours of sleep a night. Sometimes he can sleep for a week and then not sleep for two or three or four days.

Techniques for ________ sleep wouldinvol...hat sleep can occur.

下面让线程休眠1分钟的正确方法是（） A: sleep(1) B: sleep(60) C: sleep(1000) D: sleep(60000)

____ in sleep and waking times is the greatest cause of sleep problems.

Did you ____________ last night? A: sleep well B: slept good C: good sleep D: well sleep

The doctor told the child ____less and ____more. A: to eat;sleep B: eat;sleep C: eating;sleeping D: eat;to sleep

What are the two kinds of sleep we experience every night Every night we have two kinds of sleep: active sleep and

sleep

Stop______! It's time to go to bed. A: sleep B: to sleep C: sleeping

Two groups of people are compared in the third study. They are people______. A: with less than5 hours of sleep a night and with 7 to 9 hours of sleep B: who slept 4 hours a night and who slept 4 hours for 2 nights C: with less than 4 hours of sleep a night and with 7 to 9 hours of sleep D: with less than 5 hours of sleep a night and with 8 hours of sleep