单项选择题

Grouping stars by constellations is a handy way of mapping the sky.

A．nice
B．funny
C．manual
D．convenient
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单项选择题
The polar regions are generally covered with ice and snow.
A．areas
B．rocks
C．mountains
D．seas
单项选择题
Every country represented in the Olympics has a National Olympic Committee that selects the athletes who compete in the games.
A．chooses
B．honors
C．supports
D．trains
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