单项选择题

During the SARS period, it is especially important to ventilate the room.

A. dust
B. clean
C. remove
D. air
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My teacher always inspires me to do what I prefer.
A. teaches
B. asks
C. encourages
D. insists
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I went to school by subway every day.
A. channel
B. tunnel
C. train
D. underground
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