单项选择题

Recently a number of cases have been reported of young children______ a violent act previously seen on television.

A．modifying
B．signifying
C．abiding
D．duplicating
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单项选择题
However, at times this balance in nature is______ resulting in a number of possibly unforeseen effects.
A．bewildered
B．disturbed
C．mystified
D．perplexed
单项选择题
Sam assured his boss that he would______ all his energies in doing this new job.
A．call forth
B．call at
C．call on
D．call off
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