单项选择题

Human facial expressions differ from those of animals in the degree to which they can be ______ controlled and modified.

A．deliberately
B．delicately
C．definitely
D．defectively
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China started its nuclear power industry only in recent years, and should ______ no time in catching up.
A．delay
B．lose
C．lag
D．lessen
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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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