单项选择题

Modern sonar makes it possible to ______ an underwater submarine.

A．communicate
B．sink
C．search
D．locate
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单项选择题
Although the arguments were ______, he was not convinced.
A．rational
B．universal
C．apparent
D．exceptional
单项选择题
The wheels stuck in the ______.
A．mud
B．clay
C．soil
D．earth
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