美女黄频视频大全免费的,男女作爱免费网站,最好看免费的影视大全

相關推薦

大學英語六級聽力考試短文備考訓練題

　　Growth in wisdom may be exactlyi measured by decrease in bitterness.以下是小編為大家搜索整理的大學英語六級聽力考試短文備考訓練題，希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!

大學英語六級聽力考試短文備考訓練題

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

　　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.

　　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.

　　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)攜帶者體內通常會缺少維生素。研究人員檢測了通過給患者服用多種維生素片以及補充礦物質元素能否幫助提高患者機體的自然抗病能力。

　　三十年來，艾滋病一直是困擾非洲撒哈拉沙漠南部一些國家的最大的健康問題。博茨瓦納雖然有積極有力的艾滋病預防項目。但是那里的成年人當中仍然有四分之一是HIV攜帶者。這就是瑪麗安娜·鮑姆教授決定在那里對HIV和維生素之間關系進行研究的原因。

　　鮑姆教授在新近被感染的約900位成年人中進行了研究，這些人還沒有服用過針對HIV的抗艾滋病藥物。這些人被分成了幾個小組。它們給不同的小組服用不同的維生素和礦物質元素組合，其中包括維生素B、維生素C、維生素E、礦物元素硒，還有的小組僅僅服用安慰劑。大部分HIV患者體內缺乏維生素。鮑姆教授說，她本以為多種維生素片和礦物元素硒都可以單獨起到增強免疫系統的作用。但是她錯了。

　　“我們驚奇地發現只有兩者的組合才有效。”研究表明，HIV患者被感染之后很快開始服用抗逆轉錄病毒的藥物，他們就可以處于穩定的健康狀態，并且將病毒傳染給其性的伙伴的幾率也會降低。但是，很多患者沒有足夠的錢接受治療。

　　鮑姆教授說，在一些低收入國家，維生素和礦物質組合療法可能會對控制病毒有幫助。

　　“簡單地服用多維生素片添加礦物質硒可以減緩早期HIV患者的病情發展。但是需要在被感染之后盡早服用。”她說維生素療法不能替代抗逆轉錄病毒藥物，但是對于買不起抗逆轉錄病毒藥物的人來說它還是有幫助的。

　　問題13 瑪麗安娜·鮑姆教授為什么決定在博茨瓦納進行研究?

　　問題14 關于維生素與HIV的關系，瑪麗安娜·鮑姆教授發現了什么?

　　問題15 根據瑪麗安娜·鮑姆教授，我們對維生素療法了解了什么?

　　參考答案：

　　【小題13】C

　　【小題14】A

　　【小題15】D

　　習題解析：

　　【小題13】短文提到 Botswana 時，介紹那里每四個成年人就有一個是艾滋病毒攜帶者，然而該國也有積極有力的艾滋病預防項目。選項 C 符合原文，故選 C。