单项选择题

A．In June, next year.
B．In July, next year.
C．In June, two years later.
D．In July, two years later.
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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.
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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