单项选择题

Features such as height, weight, and skin color ______ from individual to individual and from face to face.

A．vary
B．change
C．alter
D．convert
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单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
单项选择题
It is ______ of him to put everything in disorder in the room. He is so peculiar.
A．unconscious
B．aware
C．typical
D．unkind
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