单项选择题

A．Growing potatoes in Ireland.
B．Drinking very strong liquors.
C．Failing to grow potatoes.
D．Brewing a very strong liquor from the potato.
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单项选择题
The phrase such powerful effects in Line 3 of Paragraph 3 refers to ______.
A．the fact that many people cannot sleep and wake refreshed
B．the fact that the brain puts us to sleep when we are worn out
C．your sight, hearing, and attention are slow to alert you to dangers
D．increased risk of health problems or a serious, even deadly accident
单项选择题
A．Different people have different time space of sleep stages.B．Some people do not need to go through all the sleep stages.C．Sleep stages will repeat themselves when someone sleeps long.D．You can remember the dream when you suddenly wake up.
A．Different people have different time space of sleep stages.
B．Some people do not need to go through all the sleep stages.
C．Sleep stages will repeat themselves when someone sleeps long.
D．You can remember the dream when you suddenly wake up.
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