单项选择题

Science and technology have ______ in important ways to the improvement of agricultural production.

A. attached
B. assisted
C. contributed
D. witnessed

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单项选择题

We don’t know why so many people in that region like to wear dresses of such（）colors.

A. low
B. humble
C. mild
D. dull

单项选择题

This is what you should bear in mind: Don’t ______ a salary increase before you actually get it.

A. hang on
B. draw on
C. wait on
D. count on

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