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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D
单项选择题
A．Courses for doctors.B．Courses for businessmen.C．Courses for reporters.D．Courses for lawyers.
A．Courses for doctors.
B．Courses for businessmen.
C．Courses for reporters.
D．Courses for lawyers.
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