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

The Western world's leading cause of early death is ______.

A．lung cancer
B．heart disease
C．bronchitis
D．insomnia

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.