单项选择题

Some of these online services are free, while others ______ a charge.

A．carry
B．cashier
C．coincide
D．collect
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单项选择题
With another Napster-like standoff over piracy and music rights , the author is using a metaphorical device that can be termed in any of the following EXCEPT ______ .
A．allusion
B．citation
C．quotation
D．reference
单项选择题
Which of the following statements does NOT refer to smallpox
A．Previous projects had failed.
B．People are no longer vaccinated for it.
C．The World Health Organization mounted a worldwide campaign to eradicate the disease.
D．It was a serious threat.
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