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
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单项选择题
They took ______ measures to prevent poisonous gases from escaping.
A. fruitful
B. beneficial
C. sufficient
D. effective
单项选择题
Radio is one of ______ means of sending news and information.
A. the most common
B. the commonest
C. more common
D. common
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