单项选择题

To meet the ever increasing demand ______ oil-refining equipment, the company will produce more of such equipment.

A. of
B. on
C. with
D. for
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单项选择题
The ______ problem of bring a space-ship back from the moon has been solved.
A. technical
B. technological
C. technique
D. technology
单项选择题
Animal mothers are devoted to their young and ______ them with love and discipline.
A. mind
B. watch
C. help
D. tend
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