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
The main idea of the passage is about_____________.
A．housewives, the wonder women
B．what would happen if housewives went on strike
C．the replacement of women by men as housewives
D．the setting up of a national holiday for housewives
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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