单项选择题

Without air, the night time（）very cold and the days burning hot.

A．be
B．would be
C．is
D．will be

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单项选择题

Although the town have been attacked by the storm several times,（）was done.

A．a few
B．few damage
C．a little damage
D．little damage

单项选择题

Water pollution, together with old tins and other forms of garbage,（）many problems in our large, industrial city today.

A．is causing
B．have caused
C．have been causing
D．are caused

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