单项选择题

Larvae are __________.

A．baby mosquitoes
B．mosquito eggs
C．animal skin
D．male mosquitoes
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单项选择题
Only the __________ will bite for blood.
A．male
B．baby mosquitoes
C．mosquito
D．female
单项选择题
It is essential that we __________ measures to protect the ozone layer.
A．will take
B．should take
C．would take
D．took
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