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单项选择题
A．30 minutes.B．20 to 30 minutes.C．15 minutes.
A．30 minutes.
B．20 to 30 minutes.
C．15 minutes.
单项选择题
A．To make recommendations on sensible dieting.B．To report the lastest advances in brain surgery.C．To advise on ways of dealing with sleep difficulties
A．To make recommendations on sensible dieting.
B．To report the lastest advances in brain surgery.
C．To advise on ways of dealing with sleep difficulties
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