单项选择题

Written records seldom tell social scientists all that they want to know about past cultures.

A．usuaIly
B．frequently
C．hardly ever
D．never
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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
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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