单项选择题

The male mosquito __________ with his mouth.

A．can only drink plant juices
B．can get blood
C．can eat anything
D．Both A and B
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I expressed hope __________ they would come to visit China again.
A．that
B．as
C．although
D．whether
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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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