单项选择题

The idea of using HIV for a beneficial purpose has been widely accepted.（）

A．Right
B．Wrong
C．Not mentioned

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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
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
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