四六级

　　英语六级听力改革后，考试题型变化较大，包括长对话、听力篇章和讲座，大家平时要有针对性的加强练习。本文是小编为大家提供的英语六级听力真题怎么练：音频在线练习第4套讲座2，希望对大家更好地进行2017年6月英语六级备考有帮助。

英语六级听力真题怎么练：音频在线练习第4套讲座2.mp3

　　Now listen to the following recording andanswer questions 19 to 21

　　19

　　A.It is required by the body for the absorption ofcalcium.

　　B.Exposure to the sun may lower your level of it.

　　C.Nuts, lentils and fatty fish don't contain it.

　　D.High level of it could be related to dementia.

　　20

　　A.47 million people suffer from dementia in the world.

　　B.Most of the dementia patients live in developed countries.

　　C.Alzheimer's disease is an unusual form of dementia.

　　D.Excess vitamin D can increase the risk of dementia.

　　21

　　A.Those who had dementia had higher vitamin D status.

　　B.Those low in vitamin D showed less short-term memory loss.

　　C.Those low in vitamin D are less capable of making decisions.

　　D.Those high in vitamin D are easy to have dementia.

　　Vitamin D is an essential vitamin required by the body for the absorption of calcium, bone development, immune functioning and alleviation of inflammation. Vitamin D comes from the sun and from some foods like nuts, lentils and fatty fish. Researchers have found that low levels of vitamin D could be related to dementia and Alzheimer's disease, one of the most common forms of dementia. Alzheimer's disease can be exhausting for caregivers and frightening to those who have it. People with Alzheimer's disease said "The worst thing that I found was I was getting lost in the car, not just forgetting where I was going, I wouldn't know where I was."

　　The World Health Organization estimates that more than 47 million people suffer from dementia, with about 60 percent of them in low and middle income countries, countries with the least ability to cope.

　　U.S. researchers studied older adults and measured both their vitamin D levels and their cognitive ability, that is, the ability to remember things and to process thoughts.

　　Some of the subjects had outright dementia, some had mild cognitive impairment and some had what we would call normal cognitive functioning. The researchers found that about 60 percent of the group was low in vitamin D. Those who had dementia also had lower vitamin D status than those who had mild cognitive impairment or who had normal cognitive functioning.

　　Those low in vitamin D showed more short-term memory loss, as well as less ability to organize thoughts and make decisions. They were declining about two-and-a-half times faster than those who had adequate vitamin D.

　　While this study shows that vitamin D seems to play a role in slowing the onset of dementia, more studies are needed to see if vitamin D supplements can help slow this decline.

　　Question 19. What can we know about Vitamin D according to the lecture?

　　Question 20. What do we know about dementia according to the lecture?

　　Question 21. What do the studies by U.S. researchers suggest?

　　参考答案：

　　【小题19】A

　　【小题20】A

　　【小题21】C

　　习题解析：

　　【小题19】听力原文中提到Vitamin D is an essential vitamin required by the body for the absorption of calcium...，由此可知，维生素D是身体吸收钙质所必需的，故选项A为答案，其他三个选项均与原文内容相反。

　　【小题20】听力原文中提到The World Health Organization estimates that more than 47 million people suffer from dementia, with about 60 percent of them in low and middle income countries...，即世界卫生组织预计，4700多万人患有痴呆症，其中大约 60%来自中低收人国家，故选项A符合原文，为答案。其他三个选项与听力原文内容不符。

　　【小题21】听力原文中提到 Those low in vitamin D showed more short-term memory loss, as well as less ability to organize thoughts and make decisions.由此可知，维生素D含量低的人表现出短期记忆力缺失以及在整理思绪和做决策等方面能力的不足，C项表述与之相符，故为答案，其中的 less capable of是对原文中 less ability to的同义复现。其他三个选项均与原文的内容相反，可排除。

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