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
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单项选择题
According to the passage, which of the following statements is CORRECT
A．Discrimination against people with AIDS is declining.
B．Homosexuals have been harassed for being possible HIV carriers.
C．HIV is transmitted through physical contact of any sort.
D．The fear of AIDS will inevitably change people's sexual behavior.
单项选择题
In the U.S. ______ percent of the infants with AIDS are white.
A．91
B．9
C．40
D．20
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