填空题
Sabin and Koprowski created their vaccines by culturing a strain of polio virus on monkey kidneys, supposedly the source of ______, now called SIV.
【参考答案】
the simian AIDS virus
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The AIDS virus is very delicate and can be killed by being ex posed to air or stomach acid.
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Some experts believe that, if not for the cultural changes that Africa has experienced, the AIDS virus would not have spread to its present extent.
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