单项选择题

Automation threatens mankind with an increased number of ______ hours.

A．useless
B．active
C．complex
D．idle
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单项选择题
His book was marred by the many remarks, which made us forget his main theme.
A．inappropriate
B．humorous
C．digressive
D．opinionated
单项选择题
He was not ______ and preferred to be alone most of the time.
A．antisocial
B．gracious
C．sociable
D．cordial
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