Questions 13 to 15 are based on the passageyou have just heard.

13

A.20% adults are infected with HIV in Botswana.

B.There aren’t aggressive AIDS preventioncampaigns.

C.Botswana’s HIV infected rate still remains high.

D.People in Botswana suffer from shortages of vitamins.

14

A.The combination of vitamin and mineral can help patients with HIV.

B.The multivitamins would help strengthen the immune system.

C.Vitamins help the body absorb mineral and keep it healthy.

D.HIV weakens the body’s natural defenses for fighting disease.

15

A.It is free of charge to the people with low income.

B.It changes HIV infection in the long run.

C.It slows rapidly the HIV disease progression.

D.It can’t take the place of anti-retroviral drugs.

Passage Two

Patients with HIV often develop shortages ofvitamins in the body. Researchers examined whethergiving these patients a multivitamin with a mineralsupplement helps to improve the body’s naturaldefenses in fighting disease.

For 30 years, AIDS has been a major health problem in some African countries south of theSahara Desert. (13) In Botswana, one of every four adults is infected with HIV. Yet the countryalso has aggressive AIDS, prevention campaigns. That is why Professor Marianna Baumdecided to carry out her research on HIV and vitamins there.

Professor Baum studied almost 900 newly infected adults in Botswana who had not yet beengiven anti-AIDS drugs that target HIV. The adults were divided into groups. Each group gotdifferent combinations of vitamins B, C, E, and the mineral selenium, or a placebo.

Most patients with HIV do not have enough vitamins. (14) Profess Baum says she thought themultivitamins by themselves or the mineral selenium by itself would help strengthen theimmune system. She was wrong.

(14) "We were surprised to find that only the combination was effective." Studies show thatwhen people with HIV begin taking anti-retroviral drugs shortly after infection, they can stayhealthy and are less likely to pass the virus to their sexual partners. But many patients do nothave enough money to pay for treatment.

Professor Baum says the vitamin and mineral therapy combination should help people in low-income countries better control the virus.

"A simple multivitamin supplementation with selenium provided early in HIV disease can actuallyslow the HIV disease progression, and it should be provided very early in HIV infection."

(15) She says the vitamin therapy should not replace anti-retroviral drugs, but it can helppeople who cannot get those medicines.

13. Why did Professor Marianna Baum decide to carry out her research in Botswana?

14. What did Professor Marianna Baum find out about vitamins and HIV?

15. According to Professor Marianna Baum, what do we know about the vitamintherapy?

文章二

艾滋病病毒(HIV)携带者体内通常会缺少维生素。研究人员检测了通过给患者服用多种维生素片以及补充矿物质元素能否帮助提高患者机体的自然抗病能力。

三十年来，艾滋病一直是困扰非洲撒哈拉沙漠南部一些国家的最大的健康问题。博茨瓦纳虽然有积极有力的艾滋病预防项目。但是那里的成年人当中仍然有四分之一是HIV携带者。这就是玛丽安娜·鲍姆教授决定在那里对HIV和维生素之间关系进行研究的原因。

鲍姆教授在新近被感染的约900位成年人中进行了研究，这些人还没有服用过针对HIV的抗艾滋病药物。这些人被分成了几个小组。它们给不同的小组服用不同的维生素和矿物质元素组合，其中包括维生素B、维生素C、维生素E、矿物元素硒，还有的小组仅仅服用安慰剂。大部分HIV患者体内缺乏维生素。鲍姆教授说，她本以为多种维生素片和矿物元素硒都可以单独起到增强免疫系统的作用。但是她错了。

“我们惊奇地发现只有两者的组合才有效。”研究表明，HIV患者被感染之后很快开始服用抗逆转录病毒的药物，他们就可以处于稳定的健康状态，并且将病毒传染给其性伙伴的几率也会降低。但是，很多患者没有足够的钱接受治疗。

鲍姆教授说，在一些低收入国家，维生素和矿物质组合疗法可能会对控制病毒有帮助。

“简单地服用多维生素片添加矿物质硒可以减缓早期HIV患者的病情发展。但是需要在被感染之后尽早服用。”她说维生素疗法不能替代抗逆转录病毒药物，但是对于买不起抗逆转录病毒药物的人来说它还是有帮助的。

问题13 玛丽安娜·鲍姆教授为什么决定在博茨瓦纳进行研究?

问题14 关于维生素与HIV的关系，玛丽安娜·鲍姆教授发现了什么?

问题15 根据玛丽安娜·鲍姆教授，我们对维生素疗法了解了什么?

参考答案：

【小题13】C

【小题14】A

【小题15】D

习题解析：

【小题13】短文提到 Botswana 时，介绍那里每四个成年人就有一个是艾滋病毒携带者，然而该国也有积极有力的艾滋病预防项目。选项 C 符合原文，故选 C。

【小题14】短文中提到，Baum 教授说她原来认为多种维生素或是砸自身都能增强免疫力，但是她错了。下文继续强调只有多种维生素和矿物质的组合才有效，故选 A。

【小题15】短文最后转述了 Baum 教授的观点，维生素疗法不能替代抗逆转录病毒药物，却能帮助那些无法得到这些药物的病人。选项 D 符合原文，故选 D。