单项选择题

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

A．subsidiary
B．submarine
C．subordinate
D．subsequent
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单项选择题
Mosquitoes are only means of ______ of malaria.
A．transference
B．transformation
C．transition
D．transmission
单项选择题
He often ______ in his speech.
A．rumbles
B．stumbles
C．tumbles
D．jumbles
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