填空题

In rural areas of China the incidence of HIV infection is rising because poor people regularly ______.

【参考答案】

sell their blood
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The incidence of HIV infection will likely be worsened by ______ in China.
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The decrease of new cases of HIV infections and AIDS deaths in Canada and the United States since 1995 is not only attributed to the availability of new drug treatments and public health programs but also the law to ban sex industry.
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