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
The ______ between Greece and Troy lasted ten years, bringing serious disasters to the people of two nations.
A．collisions
B．combats
C．contradictions
D．conflicts
单项选择题
In our highly technological society, the number of jobs for unskilled workers is ______.
A．shrinking
B．obscuring
C．altering
D．constraining
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