单项选择题

According to the passage, which of the following could be considered as a healthy diet

A．A diet that is sugar free but nutrient-rich.
B．A diet that is sodium free but vitamins-rich.
C．A diet that contains a lot of potassium and calcium.
D．A diet that consists of low-fat meat and fresh plants.
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单项选择题
According to Dr. Ralph Paffenbager's study, ______.
A．aerobic exercise help prevent lung diseases
B．vigorous exercise is dangerous for poeple over 50
C．weight lifting can do much good to the frail elderly
D．the more exercise one does, the less one is likely to die
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Which of the following is NOT mentioned as a high-risk group in danger of contracting AIDS
A．People engaged in the business of entertainment.
B．Homosexual and bisexual men.
C．Intravenous drug users.
D．Poor urban residents.
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