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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The atmosphere, a narrow band of gases surrounding the Earth, is maintained by gravitational pull.
A. clear
B. freezing
C. thin
D. poisonous
单项选择题
An oyster produces a pearl by coating a grain of sand inside its shell with nacre, a secretion of its body.
A. makes
B. attains
C. binds
D. cures
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