单项选择题

Many scientists remain ______ about the value of this research program.

A．spacious
B．stationary
C．specific '
D．skeptical
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单项选择题
Having been found guilty, the man was given a severe ______ by the judge.
A．service
B．sentence
C．crime
D．crisis
单项选择题
Although he has had no formal education, he is one of the ______ businessmen in the company.
A．shrewdest
B．sternest
C．nastiest
D．alertest
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