单项选择题

The passage mainly discusses ______.

A．the number of people being attacked by sharks
B．the benefits of sharks to improving human health
C．the dangers sharks have brought to human beings
D．the relationship between sharks and human beings

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单项选择题

The word prey in Line 5 of Paragraph 1 is closest in meaning to ______.

A．friends
B．enemies
C．food
D．suits

单项选择题

It can be inferred from the passage that ______.

A．most sharks are dangerous to human beings
B．sharks only attack someone in black wet suits
C．movies and popular novels are always misleading
D．sharks are a valuable resource for human beings