单项选择题


A．Doctor and patient.
B．Student and teacher.
C．Sales assistant and customer.
D．Manager and officer clerk.
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单项选择题
A．Forty or fifty minutes of exercise once a week.B．Twenty or thirty minutes of exercise every day.C．Fifteen or twenty minutes of exercise five days a week.D．Thirty or forty minutes of exercise three or four days a week.
A．Forty or fifty minutes of exercise once a week.
B．Twenty or thirty minutes of exercise every day.
C．Fifteen or twenty minutes of exercise five days a week.
D．Thirty or forty minutes of exercise three or four days a week.
单项选择题
A．They are the same person.B．One is a doctor and the other is a writer.C．Both of them are teachers.D．They are from different departments.
A．They are the same person.
B．One is a doctor and the other is a writer.
C．Both of them are teachers.
D．They are from different departments.
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