单项选择题

We are using up our natural resources too quickly and at the same time we are ______ our environment with dangerous chemicals.

A．protecting
B．saving
C．polluting
D．fighting
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单项选择题
We don't know what the surface of Venus might ______ .
A．look as
B．look like
C．look over
D．look about
单项选择题
I will go back to my hometown as soon as I ______ my examinations.
A．will finish
B．finish
C．has finished
D．would finish
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