单项选择题

Although students may be in a ______ position, teachers should treat them as equals.

A．subsidiary
B．submarine
C．subordinate
D．subsequent
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单项选择题
A ______ is a very infectious disease that spreads quickly and kills large numbers of people.
A．plague
B．outbreak
C．pledge
D．nightmare
单项选择题
We used to swim in this lake, but now it is seriously ______.
A．contemplated
B．contrived
C．corrupted
D．contaminated
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