单项选择题

The author escaped from the attack of the shark by___________.

A．turning around suddenly
B．screaming
C．swimming back to the shore
D．throwing rubber fins at him
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单项选择题
The Greeks call sharks hounds of the sea because____________.
A．they can follow a scent just like dogs
B．they can move swiftly under the sea
C．they are hostile to divers
D．they have very strong basic instincts
单项选择题
There is a misunderstanding that___________.
A．sharks can discover a diver by the movement of his hands in water
B．sharks have very strong sense of smell
C．sharks have poor eyesight
D．sharks are great threats to divers
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