单项选择题

Air, or （）is called the atmosphere, surrounds the whole world.

A. it
B. which
C. what
D. that

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单项选择题
— I don’t like chicken （）fish. —I don’t like chicken, （）I like fish very much.

A. and; and
B. and; but
C. or; but
D. or; and
单项选择题
I have bought two ball-pens，（）writes well．

A．none of them
B．neither of them
C．neither of which
D．none of which
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