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单项选择题
A．Only mosquitoes can change their body-chemistry.B．They can transmit a serious disease.C．We can wipe them out with new insecticide.D．Within five years scientists will have found a way to kill them all.
A．Only mosquitoes can change their body-chemistry.
B．They can transmit a serious disease.
C．We can wipe them out with new insecticide.
D．Within five years scientists will have found a way to kill them all.
单项选择题
A．One in every 24 minutes.B．One in every 10 minutes.C．One in every 7 minutes.D．One in every 4 minutes.
A．One in every 24 minutes.
B．One in every 10 minutes.
C．One in every 7 minutes.
D．One in every 4 minutes.
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