单项选择题

The conference has been held to discuss the effect of tourism_________ the wildlife in the area.

A．in
B．on
C．at
D．with
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单项选择题
When he left_________ college, he got a job as_________ reporter in a newspaper office.
A．/; a
B．/; the
C．a; the
D．the; the
单项选择题
Although he has taken a lot of medicine, his health _________ poor.
A．proves
B．remains
C．maintains
D．continues
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