单项选择题

FDA has approved the plan of using HIV to cure cancer in humans.（）

A． Right
B． Wrong
C． Not mentioned

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单项选择题
The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
A．suddenly
B．gradually
C．excessively
D．exceptionally
单项选择题
It has been said that the Acts provided a new course of action and did not merely regulate or enlarge an old one.
A． control
B．limit
C．replace
D．offset
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