单项选择题

"Couch potatoes" probably means ______.

A．people who suffer high mortality
B．people who take little exercise
C．people who walk 40 miles a week
D．people who have a lower rate of heart disease

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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.

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