单项选择题

Which of the following is NOT mentioned as a high-risk group in danger of contracting AIDS

A．People engaged in the business of entertainment.
B．Homosexual and bisexual men.
C．Intravenous drug users.
D．Poor urban residents.
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单项选择题
The experiment described in the passage shows that ______.
A．an infant prodigy performs much better than ordinary kids
B．developmental psychology is an interesting subject
C．babies can learn intricate tricks so long as they are trained
D．toys are important tools to teach science with
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
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