[单项选择]Passage two After 25 years battling the mother of all viruses, have we finally got the measure of HIV Three developments featured in this issue collectively give grounds for optimism that would have been scarcely believable a year ago in the wake of another failed vaccine and continuing problems supplying drugs to all who need them. Perhaps the most compelling hope lies in the apparent “cure” of a man with HIV who had also developed leukemia. Doctors treated his leukemia with a bone marrow transplant that also vanquished the virus. Now US Company Sangamo Biosciences is hoping to emulate the effect patients being cured with a single shot of gene therapy, instead of taking antiretroviral drugs for life. Antiretroviral therapy (ART) is itself another reason for optimism. Researchers at the World Health Organization have calculated that HIV could be effectively eradicated in Africa and other hard-hit places using existing drugs. The trick is to test everyone often, and give those who te
A. HIV will be virtually wiped out first in Africa
B. the cycle of HIV infection can be broken with ART
C. the circulating levels of HIV have been limited to almost zero
D. the existing HIV drugs will be enhanced to be more effective in 25 years

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