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.
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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.
单项选择题
A．She doesn’t need a new roll of film yet.B．She still hasn’t finished the first roll.C．She’ll soon have two rolls to be developed.D．She’d like him to develop the first film for her now.
A．She doesn’t need a new roll of film yet.
B．She still hasn’t finished the first roll.
C．She’ll soon have two rolls to be developed.
D．She’d like him to develop the first film for her now.
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