单项选择题

In almost all chemical-process plants, heat is ______ by burning of fossil fuels-coal, oil, or natural gas.

A．transformed
B．conducted
C．transferred
D．generated
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单项选择题
I decided to get in touch with him ______ after I received his letter.
A．promptly
B．quickly
C．hastily
D．urgently
单项选择题
Mr. Morton gradually ______ a knowledge of the subject.
A．attained
B．required
C．acquired
D．enquired
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