单项选择题

According to Hahn, all the following increase the transmission of AIDS virus EXCEPT ______.

A．hunting and killing more chimpanzees.
B．more champ hunters moving to cities
C．people's changed sexual behaviors.
D．travelling to more African countries.

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单项选择题

The significance of the finding is that ______.

A．people now know the number of chimpanzees is much smaller than expected
B．it may make it possible for scientists to discover new ways of treating AIDS.
C．it proves some deadly human diseases can also be transmitted to wild animals
D．it will soon help the scientists develop a vaccine that prevents the AIDS virus

单项选择题

What does the word hip mean in this passage

A．It is derived from "hippie".
B．It means following the social fashion in the 1960s and 1970s.
C．It comes from a more recent useage.
D．It means “out - of - date slang”.