单项选择题

Why does the shark never stop moving

A．It never sleeps.
B．It can only smell when moving.
C．If stopped it would sink.
D．It must eat constantly.
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单项选择题
Why do sharks normally swim between ten and twenty miles off the coast of Britain
A．They prefer warm water to cold water.
B．They see best in deep water.
C．They are afraid of man.
D．That is where their food is.
单项选择题
Why did he want to talk to her
A．We are not told.
B．He wanted to tell her how nice her flat was.
C．He wanted to introduce himself.
D．She had done something to offend him.
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