强化组Passage 1

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　　[2016·武邑中学一轮检测]WASHINGTON—Patients with HIV, the virus that causes AIDS, often develop vitamin deficiencies (缺乏). A new study has found that giving these patients a multivitamin with a mineral supplement (补充)

　　helps to fight the disease and slows the disease's progression.

　　Sub­Saharan Africa has always been the center of the AIDS. In Botswana, despite aggressive prevention campaigns, one out of four adults is infected with HIV. Professor Marianna Baum based her latest research there.

　　Baum recruited almost 900 newly infected adults who had not yet received the anti­AIDS drugs that target the virus.

　　These adults were then divided into groups that randomly received different combinations of vitamins B, C and E, the mineral selenium (硒) or a placebo (安慰剂)．

　　Most patients with HIV become deficient in these vitamins, which help improve immunity (免疫力). Baum said she initially thought the multivitamins alone or selenium alone would be effective in strengthening the immune system, but found that incorrect.

　　“We were surprised to find that only the combination was effective，” said Baum.

　　Research shows that when people with HIV receive anti­retroviral drugs (抗逆转录病毒药物) shortly after infection, they can remain healthy and are less likely to pass the virus to others. For many countries, however, the cost of these anti­AIDS drugs is

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