单项选择题

Which of the five points offers advice on the improvement of work performance

A．Point 2.
B．Point 3.
C．Point 4.
D．Point 5.
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The people who have cell car phones are in the age group of
A．15--29.
B．10--14.
C．11--16.
D．20's.
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The percentage of girls singing karaoke is
A．63.
B．83.
C．42.
D．27.
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