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 author is a ______.

A．travel guide
B．language professor
C．school supervisor
D．talkshow host

单项选择题

Many AIDS experts are not completely satisfied with results of the study because ______.

A．only a limited number of chimpanzees are used for sampling the virus.
B．it is now extremely difficult to find chimpanzees that carry the virus.
C．the samples collected are from two different subspecies of chimpanzees.
D．it does not provide reliable evidence of the link between SIV and HIV - 1.