单项选择题

Oil prices are likely to fluctuate because of

A．the economic boom in many countries.
B．the refusal of many countries to export oil.
C．the embargo against Iraqi oil exports.
D．competition among exporting countries.
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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 behaviour.
D．travelling to more African countries.
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