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．At the library.B．In a lecture hall.C．On Martha’s Vineyard.D．At a telephone laboratory.
A．At the library.
B．In a lecture hall.
C．On Martha’s Vineyard.
D．At a telephone laboratory.
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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