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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单项选择题

In ____________ to your belief that we shall fail, I know we shall succeed.

A．opposition
B．comparison
C．contrary
D．contrast

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