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
The old concerns lose importance and some of them vanish altogether.
A. develop
B. disappear
C. link
D. renew
单项选择题
Cement was seldom used in building the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
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