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 don' t understand why people ______ such a beautiful garden with cans and bottles.
A．located
B．provided
C．protected
D．littered
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