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
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”.
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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
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