单项选择题

The child's earliest words deal with concrete objects and actions, it is much later that he is able to grapple with ______.

A．decisions
B．abstractions
C．opponents
D．mathematics
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单项选择题
You are afraid to attack him directly. You, therefore, are resorting to ______.
A．criticism
B．condemantion
C．innuendo
D．effrontery
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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