单项选择题

Of all the senses that help a small baby to distinguish his mother, sight is _________.

A．permanent
B．prevalent
C．predominant
D．preliminary
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单项选择题
He received a(n) _________ letter threatening to disclose his affair with that woman.
A．ambiguous
B．vigorous
C．anonymous
D．autonomous
单项选择题
The submarine cruising on the sea _________ when it detected the enemy planes.
A．immersed
B．drowned
C．converged
D．submerged
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