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

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热门试题

单项选择题

The word Wunderkind probably means ______.

A．box
B．young genius
C．puzzle
D．squeal

单项选择题

In the passage, cohorts (in the first line of the 4th paragraph) refer to ______.

A．the toys the miniprofessor used
B．the babies taking part in the research
C．the researchers conducting the study
D．the teachers at the day-care center