单项选择题

All human beings have a comfortable zone regulating the ______ they keep from someone they talk with.

A．distance
B．scope
C．range
D．boundary
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单项选择题
She had a tense expression on her face, ______ she were expecting trouble.
A．even though
B．as though
C．even as
D．now that
单项选择题
Color and sex are not relevant ______ whether a person is suitable for the job.
A．on
B．for
C．to
D．with
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