单项选择题

A． They will stop breathing.
B． When they wake up, it’s hard for them to go back to sleep again.
C． It can happen several hundred times one night.
D． In the morning, they will remember waking up.
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单项选择题
A． They want to continue their negotiation in Hong Kong.B． They will push the US to drive down the global cotton price.C． They want the US to reform its policies with the European Union.D． They hope the US will stop providing subsidies to its cotton farmers.
A． They want to continue their negotiation in Hong Kong.
B． They will push the US to drive down the global cotton price.
C． They want the US to reform its policies with the European Union.
D． They hope the US will stop providing subsidies to its cotton farmers.
单项选择题
A． why do people fall asleepB． three kinds of sleep disordersC． the treatment for sleep disordersD． staying up too late can be harmful
A． why do people fall asleep
B． three kinds of sleep disorders
C． the treatment for sleep disorders
D． staying up too late can be harmful
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