单项选择题

It is often more difficult than to get financial support for scientific research.

A．obtaining trained men
B．to find trained men
C．in getting men trained
D．recruiting experienced men
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单项选择题
Though steam engines have now passed the _________ of their usefulness, their heritage remains.
A．prime
B．era
C．epoch
D．date
单项选择题
The government _________ to approve the use of wide -spead surveillance when the Justice Department took objections.
A．is going
B．had been
C．was about
D．is coming
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