单项选择题

Seasonal variations in tides are due mainly to the gravitational pull of the moon.

A．merely
B．mostly
C．likewise
D．somewhat
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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
单项选择题
The polar regions are generally covered with ice and snow.
A．areas
B．rocks
C．mountains
D．seas
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