单项选择题

Sounds can be called a language only when they have a structure and a grammar.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
The dolphin leapt up into the air because Sagan was too near the water.
A． Right
B． Wrong
C． Not mentioned
单项选择题
It is no use debating the relative merits of this policy.
A．making
B．taking
C．discussing
D．expecting
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