单项选择题

Human language is ______ to humans although some of the distinctive features of human speech may be observed in other species.

A. individual
B. unique
C. private
D. personal
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单项选择题
Not long ago we reported a case ______ a child died of fright caused by the approach of a police officer in uniform.
A. that
B. whose
C. what
D. where
单项选择题
I do think that everyone has their own variable limits and their own characteristic virtues, ______
A. doesn't he
B. don't they
C. does he
D. don't I
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