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
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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
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
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