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.
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单项选择题
A．Hiding under a tree.B．Entering the house.C．Driving a car.D．Lying on the ground.
A．Hiding under a tree.
B．Entering the house.
C．Driving a car.
D．Lying on the ground.
单项选择题
WHO Western Pacific Regional Director Shigeru Omi said that a bird flu pandemic had killed a lot of Asian people.
A．Y
B．N
C．NG
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