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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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
Many of the students have a grasp of the main structures, a reasonable vocabulary and a(n) ______ idea of how to pronounce most words they come across.
A．faint
B．vague
C．obscure
D．rough
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