单项选择题

Some people have nothing to eat, ______ others eat too much.

A. until
B. unless
C. while
D. if
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单项选择题
______ is often more difficult to find trained men than to get financial support for scientific research.
A. It
B. That
C. This
D. What
单项选择题
They took ______ measures to prevent poisonous gases from escaping.
A. fruitful
B. beneficial
C. sufficient
D. effective
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