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
Expected noises are usually more ______ than unexpected ones of the like magnitude.
A．manageable
B．controllable
C．tolerable
D．perceivable
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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