单项选择题

There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.

A．beats
B．matches
C．maintains
D．announces
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单项选择题
Techniques to employ the energy of the sun are being developed.
A．convert
B．store
C．use
D．receive
单项选择题
During the past ten years there have been dramatic changes in the international situation.
A．permanent
B．powerful
C．striking
D．practical
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