单项选择题

The captain of the ship ______ the passengers that there was no danger.

A．insured
B．assured
C．ensured
D．secured
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单项选择题
I have omitted many things which ______ a place in the book.
A．reserved
B．deserved
C．preserved
D．observed
单项选择题
Mosquitoes are only means of ______ of malaria.
A．transference
B．transformation
C．transition
D．transmission
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