单项选择题

Some plants are so sensitive ______ pollution that they can only survive in a perfectly clean environment.

A．from
B．against
C．to
D．with
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单项选择题
Our new house is very ______ for the office as I can get there in five minutes.
A．convenient
B．comfortable
C．suitable
D．available
单项选择题
She had a tense expression on her face, ______ she were expecting trouble.
A．even though
B．now that
C．even as
D．as though
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