单项选择题

Wireless waste from cell phones, pocket PCs, and music players ______ special problems because they have toxic chemicals in batteries and other components.

A．pose
B．commit
C．transport
D．expose
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单项选择题
The Board of Directors decided that more young men who were qualified would be ______ important positions.
A．attributed to
B．furnished with
C．installed in
D．inserted into
单项选择题
Recently a number of cases have been reported of young children ______ a violent act previously seen on television.
A．stimulating
B．duplicating
C．modifying
D．accelerating
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