单项选择题

Most comets have two kinds of tails, one made up of dust, （）made up of electrically charged particles called plasma.

A．one another
B．the other
C．other ones
D．each other

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单项选择题
Columbus had accomplished one of the most amazing and courageous（）in history.

A．performance
B．feats
C．events
D．acts
单项选择题
English language publications in China are growing in volume and（）

A．circulation
B．rotation
C．circumstance
D．appreciation
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