单项选择题

A．They are not as dangerous as people think.
B．They can be as friendly to humans as dogs.
C．They attack human beings by nature.
D．They are really tame sea animals.
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单项选择题
A．200, 000 tons.B．2 million tons.C．20 million tons.D．2,000 tons.
A．200, 000 tons.
B．2 million tons.
C．20 million tons.
D．2,000 tons.
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