单项选择题

A．exposing
B．concealing
C．detecting
D．exhibiting
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单项选择题
A．advantageB．convenienceC．benefitD．interest
A．advantage
B．convenience
C．benefit
D．interest
填空题
made a lot of studies to discover the seasons when people read serious books, attend scientific meetings, make the highest scores on examinations, and suggest the most changes to patents.
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