单项选择题

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

A. sufficiently
B. noticeably
C. intentionally
D. absolutely
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单项选择题
These are our motives for doing it.
A. reasons
B. arguments
C. targets
D. stimuli
单项选择题
The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.
A. imprecise
B. concise
C. unpolished
D. elementary
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