单项选择题

A．About every five minutes.
B．about every six minutes.
C．About every seven minutes.
D．About every eight minutes.
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单项选择题
A．To play games with them.B．To help solve their psychological problems.C．To send they to the hospital.D．To make them aware of its harmfulness.
A．To play games with them.
B．To help solve their psychological problems.
C．To send they to the hospital.
D．To make them aware of its harmfulness.
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