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 alert

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单项选择题
The Austria Big Dry ______.
A. has lasted for months
B. was going to lessen its strength and power
C. was so severe that some land has become dust
D. has caused some death
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. 8 to 10 seconds.
D. About 5 seconds.
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