单项选择题

The two things are the same in outward form but different ________.

A．in addition
B．in brief
C．in common
D．in essence
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单项选择题
He and other environmentalists often went to scenic ________ to collect litter people had left.
A．vicinities
B．spots
C．locations
D．localities
单项选择题
Our research has focused on a drug which is so ________ as to be able to change brain chemistry.
A．powerful
B．influential
C．monstrous
D．vigorous
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