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
In order to photograph ______ animals, elaborate flashlight equipment is necessary.
A．predatory
B．wild
C．nocturnal
D．rare
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