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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单项选择题
Medicine depends on other fields for basic information, particularly some of their specialized branches.
A．conventionally
B．obviously
C．especially
D．inevitably
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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