单项选择题

During the past ten years there have been dramatic changes in the international situation.

A．permanent
B．powerful
C．striking
D．practical
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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 idea of using HIV for a beneficial purpose has been widely accepted.
A． Right
B． Wrong
C． Not mentioned
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