单项选择题

A．To make recommendations on sensible dieting.
B．To report the latest advances in brain surgery.
C．To relate an experiment combining sleep and exercise.
D．To advise on ways of dealing with sleep difficulties.
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单项选择题
A．Property owned by a group of people.B．Privately-owned property.C．Government-owned property.D．People’’s joint effort to share and protect natural resources.
A．Property owned by a group of people.
B．Privately-owned property.
C．Government-owned property.
D．People’’s joint effort to share and protect natural resources.
填空题
essential
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