单项选择题

Sea shells______as money at some time and another over the greater part of the Old World. These were collected mainly from the beaches of the Maldives Island in the Indian Ocean.

A. had been used
B. are used
C. would be used
D. would have been used

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Is there any chance that Jiajia and Lingling will have a baby according to zookeepers

A．Yes, there is 75 percent chance.
B．Yes, there is 65 percent chance.
C．Yes, there is 55 percent chance.
D．No, there is no chanc

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We can infer from the passage that the author’s attitude toward free education is

A．negative
B．critical
C．positive
D．sarcastic

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