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

Which of the following is TRUE of CF echoes

A．They enable the bat to determine the size of the target.
B．They help identify the range of widely spaced targets.
C．In some species, they enable the bat to judge whether it is closing in on its target.
D．In some species, they help the bat to tell the shape of the target.

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 [or 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.