2015年12月英语六级听力VOA常速练习19
听力部分一直以来都是同学们考试时的难点，也是吐槽最多的部分。想要早点为下半年的四六级考试做准备就来四六级考试网练习一下英语六级听力题吧，考虑六级听力的特点，我们特别准备了VOA的常速听力材料哦。听力音频点击下载.mp3
听力材料：
Vitamin D comes from the sun and from some foodslike nuts, lentils and fatty fish.
Researchers have found that low levels of vitamin Dcould be related to dementia and Alzheimer'sdisease, one of the most common forms ofdementia. Alzheimer's can be exhausting forcaregivers and frightening to those who have it.
The worse thing that I found was I was getting lost in the car, not just forgetting where I wasgoing, 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 leastability to cope.
U.S. researchers studied older adults and measured both their vitamin D levels and theircognitive 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 somehad 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 cognitiveimpairment or who had normal cognitive functioning,”
Those low in vitamin D showed more short-term memory loss, as well as less ability toorganize thoughts, prioritize tasks and make decisions.
They were declining about two-and-a-half times faster than those who had adequate vitaminD.
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.
The study was published in the Journal of the American Medical Association.
1.get lost 迷路
例句：We got lost in this unfamiliar city.
在这个陌生的城市里我们迷路了。
2.the onset of 开始
例句：At the onset of a development project, there is project uncertainty.
在开发项目的开始阶段，存在项目不确定性。
3.be related to 与…有关
例句："We think that if there is life on Mars, it could be related to us, " Massachusetts Institute of Technology engineer and scientist Christopher Carr told Discovery News.
“我们认为，如果火星上有生命存在，它可能跟我们是相关联的。” 麻省理工学院的工程师,科学家克里斯托弗·卡尔在探索新闻中说。
4.short-term memory 短期记忆
例句：One study showed that the equivalent of two cups of coffee can boost short-term memory and reaction time.
有研究表明相当于两杯咖啡的咖啡因可以提升短期记忆力和缩短反应时间。
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