单项选择题

Some studies confirmed that this kind of eye disease was ______ in tropical countries.

A．prospective
B．prevalent
C．provocative
D．perpetual
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单项选择题
Bill is an example of a severely disabled person who has become ______ at many survival skills.
A．proficient
B．persistent
C．consistent
D．sufficient
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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