单项选择题

A．To recite a lot of wonderful reading materials.
B．To combine prefixes, suffixes and roots freely.
C．To take part in a lot of good talks.
D．To make as many word lists as possible.
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A．It is extremely dangerous to fly in the dark.B．Noise regulations restrict the hours of airport operation.C．Some of its runways are not in good condition.D．Cargo planes produce more disturbing noises at night.
A．It is extremely dangerous to fly in the dark.
B．Noise regulations restrict the hours of airport operation.
C．Some of its runways are not in good condition.
D．Cargo planes produce more disturbing noises at night.
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