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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单项选择题
Mr. Morton gradually ______ a knowledge of the subject.
A．attained
B．required
C．acquired
D．enquired
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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