单项选择题

The United States Food and Drag Administration has shown itself to be particularly wary with regard to alleged "miracle" drugs in recent times.

A．bellicose
B．exhausted
C．cautious
D．strange
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单项选择题
In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space exploration.
A．probing
B．revenge
C．invasion
D．expansion
单项选择题
She was so obstinate that she wouldn't adjust her opinions.
A．inflexible
B．alert
C．wise
D．talented
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