[单项选择]By 2003 an estimated 42 million people were infected (47) and more than 20 million people had died of AIDS. A United Nations report presented in 2002 (48) that unless prevention programs were greatly expanded, AIDS would claim an (49) 68 million lives by 2020. Sub-Saharan Africa has been the region hardest hit by the HIV/AIDS pandemic; more than two-thirds of all people with HIV/AIDS are in this region. In the United States, an (50) 900,000 people were living with HIV/AIDS in 2002. HIV is spread through contact with (51) body fluids such as blood and semen. Infected people may harbor the virus within their bodies for several years or even longer before developing symptoms of AIDS. Though symptomless, they can still infect others. Worldwide, most HIV (52) occurs during sexual relations between heterosexual partners. In the United States, the majority of transmission has been between homosexual partners. Transmission among drug addicts who (53)

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[单项选择]By 2003 an estimated 42 million people were infected (47)______ and more than 20 million people had died of AIDS. A United Nations report presented in 2002 (48)______ that unless prevention programs were greatly expanded, AIDS would claim an (49)______ 68 million lives by 2020. Sub-Saharan Africa has been the region hardest hit by the HIV/AIDS pandemic; more than two-thirds of all people with HIV/AIDS are in this region. In the United States, an (50)______ 900,000 people were living with HIV/AIDS in 2002. HIV is spread through contact with (51)______ body fluids such as blood and semen. Infected people may harbor the virus within their bodies for several years or even longer before developing symptoms of AIDS. Though symptomless, they can still infect others. Worldwide, most HIV (52)______ occurs during sexual relations between heterosexual partners. In the United States, the majority of transmission has been between homosexual partners. Transmission among drug addicts who (53)

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