单项选择题

A．A student.
B．A lecturer.
C．A group leader.
D．The chairman.
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单项选择题
A．Because the insects are the most successful creatures.B．Because the insects give birth all the time.C．Because the insects can adapt to new situations quickly.D．Because the insects were the first creatures coming to the earth before humans.
A．Because the insects are the most successful creatures.
B．Because the insects give birth all the time.
C．Because the insects can adapt to new situations quickly.
D．Because the insects were the first creatures coming to the earth before humans.
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.
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