单项选择题

The people for the experiment were chosen completely ______.

A．at length
B．in essence
C．at random
D．in bulk
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单项选择题
Efforts to reach the injured men have been ______ because of a sudden deterioration in weather conditions.
A．enforced
B．intensified
C．continued
D．strengthened
单项选择题
I've never ______ the theory that people am more important than animals.
A．subscribed to
B．hung on
C．engaged in
D．indulged in
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