The underlined word in Paragraph 1 means______.
A. obligation
B. sleep
C. hibernation
D. vacation
查看答案
We can learn from Paragraph 1 that______.
A. the average adult sleeps one and a half hours less than last century
B. 24-hour entertainment offers those who can"t sleep a way to kill time
C. lack of sleep may harm one"s health and even threaten his/her life
D. people always don"t have the incentive to get more sleep
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