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
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
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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