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
Lessons written in blood ______ the colonial people to uprising.
A．propelled
B．prompted
C．promoted
D．proceeded
单项选择题
The laser represents a true marriage between science and technology, the men who devised it were ______ engineers and physicists.
A．spontaneously
B．simultaneously
C．instantaneously
D．homogeneously
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