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 can pass on the virus to others
C．the number of AIDS cases will be reduced in the 1990s
D．IV drug users are a high-risk group of people vulnerable to AIDS infection

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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

The word Wunderkind probably means______.

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