单项选择题

Academic papers are often part of a university's official file and can neither be returned to students nor duplicated.

A. borrowed
B. copied
C. purchased
D. destroyed
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单项选择题
Techniques to harness the energy of the sun are being developed.
A. convert
B. store
C. utilize
D. receive
单项选择题
In a bullfight, it is movement, not the color, of subjects that arouses the bull.
A. confuses
B. excites
C. scares
D. diverts
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