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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For young children, getting dressed is a complicated business.
A.personal
B.strange
C.funny
D.complex
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Cement was seldom used in buildings of the Middle Ages.
A.slight
B.rarely
C.originally
D.occasionally
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