单项选择题
One of the results of grief mentioned in the passage is
A.loss of friendships.
B.diminished socializing.
C.vulnerability to disease.
D.loss of appetite.
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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 behaviours.
D.travelling to more African countries.
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单项选择题
The biggest worry that the researchers now have is
A.more and more wild chimpanzees are being slaughtered.
B.AIDS virus is difficult to be killed and controlled.
C.it is not easy to repair people's deficient immune systems.
D.many dangerous viruses are being transmitted to humans.
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