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.
单项选择题
American city buses before 1960s didn’’t allow black people to sit in the middle of the bus.
A．Y
B．N
C．NG
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