The Americans won the war of independence in the decisive battle at ______.

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

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