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
There is no electricity again. Has the ______ blown then
A．fuse
B．plug
C．wire
D．circuit
单项选择题
Our country was founded on the lofty principles of freedom and justice for all. Our lofty principles ought to be ______.
A．faced up to
B．looked up to
C．lived up to
D．made up to
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