单项选择题

The most important thing to do （） the pollution as soon as possible.

A．are got rid of
B．is to get rid of
C．is get rid of
D．is for us getting rid of

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（） hero as he is, he is sometimes afraid.

A．/
B．A
C．An
D．The
单项选择题
My mother bought me two hats, but I liked （） of them.

A．both
B．either
C．none
D．neither
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