单项选择题

Molten iron is poured into the mixer in the same way _________ tea is poured into a cup from a teapot.

A．as
B．that
C．since
D．like
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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
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
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