单项选择题

The most pressing problem that any country faces is how to use its scarce natural resources.

A. puzzling
B. difficult
C. terrifying
D. urgent
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单项选择题
A beautiful woman attended to me in that store yesterday.
A. waited on
B. talked to
C. spoke to
D. stayed With
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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