单项选择题

This passage is primarily about （）

A．driving carefully
B．the city of Swansea, Wales
C．a road that caved in
D．tunnels that ants build

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单项选择题
According to the passage, how often does REM sleep occur in one night（）

A．Once
B．Twice
C．Four or five times
D．Forty times
单项选择题
One who has an intelligent mind is （）

A．very strong
B．healthy
C．very clever
D．stupid
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