单项选择题

Even when textbooks are ______ through a school system, methods of teaching may vary greatly.

A. commonplace
B. standardized
C. competitive
D. generalized
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单项选择题
If the world is to remain peaceful the utmost effort must be made by nations to limit local ______.
A. collisions
B. combats
C. contradictions
D. conflicts
单项选择题
A budget of five dollars a day is totally ______ for a trip round Europe.
A. inadequate
B. incapable
C. incompatible
D. invalid
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