单项选择题

From science courses students should（）a useful command of science concepts and principles

A．require
B．acquire
C．demand
D．inquire

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单项选择题
His colleagues were envious（）his promotion.

A. by
B. of
C. with
D. to
单项选择题
The two newspapers gave different （）of what happened.

A. versions
B. editions
C. productions
D. texts
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