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

It can be concluded from the passage that ______.

A．all HIV carriers are doomed to die
B．only those who show clinical evidence of AIDS will pass on the virus
C．the number of AIDS cases will be reduced in the 1990s
D．IV drug users are a high-risk group vulnerable to AIDS infection