单项选择题

Mosquitoes are only means of ______ of malaria.

A．transference
B．transformation
C．transition
D．transmission
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单项选择题
He often ______ in his speech.
A．rumbles
B．stumbles
C．tumbles
D．jumbles
单项选择题
What is it that the author wants to ______ to his readers through the story
A．convey
B．convince
C．convert
D．conform
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