单项选择题

A．They are a threat to most forms of living creatures.
B．They cannot be controlled effectively.
C．They will be wiped out with male mosquitoes one day from the earth.
D．They are a necessary element in the balance of nature.
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单项选择题
A．It cost much more than its worth.B．It should be brought up-to-date.C．It calls for immediate repairs.D．It can still be used for a long time.
A．It cost much more than its worth.
B．It should be brought up-to-date.
C．It calls for immediate repairs.
D．It can still be used for a long time.
单项选择题
In 1997, some provinces had established the AIDS prevention and control coordination meeting system respectively.
A．Y
B．N
C．NG
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