单项选择题

Although fish have no vocal organs,they still are able to make noises.

A．signals
B．bubbles
C．sounds
D．ripples
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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
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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