单项选择题

How long will the sucking of the mosquito last

A．Less than 8 seconds.
B．No more than 12 seconds.
C．Eight to 10 seconds.[C] About 5 seconds.
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单项选择题
The ultimate purpose of the research is to ______.
A．have a better understanding of the life of mosquitoes
B．prevent human beings from being bitten by mosquitoes
C．purify the environment
D．keep people healthy
单项选择题
What is the sure way to stop being the target of mosquitoes
A．Stopping breathing.
B．Taking. a bath.
C．Reducing the sweat.
D．Wearing skin care products.
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