单项选择题

Contrary to popular belief, epidemics do not occur ________ after a natural disaster.

A．spontaneously
B．simultaneously
C．homogeneously
D．instantaneously
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单项选择题
Benjamin Franklin ________ and presented to Congress, on the 21st of July, a plan of confederation.
A．draw in
B．draw on
C．draw up
D．draw down
单项选择题
Looking back upon the whole process, we have every reason to ________ our success to Mary who suggested the right method at the beginning.
A．ascribe
B．ascertain
C．aspire
D．assert
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