单项选择题

There is an ______ need for more socioeconomic information in this field to help set guidelines for the future.

A. acute
B. acid
C. urgent
D. impending
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单项选择题
She remains confident and ______ untroubled by our present problems.
A. indefinitely
B. infinitely
C. optimistically
D. seemingly
单项选择题
As 4 to 8, ______ 8 is to 16.
A. as
B. so

C. that

D. which
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