单项选择题

The Greeks call sharks "hounds of the sea" because ______.

A．they can follow a scent just like clogs
B．they can move swiftly under the sea
C．they are hostile to divers
D．they have very strong basic instincts
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单项选择题
The best title for the passage is ______.
A．The Mysteries of Animal Communication
B．Something Unknown About Sharks
C．An Adventure
D．How Divers Discover Sharks Under the Sea
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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