题目内容
3．Health experts have long known that vitamin D is important for healthy bones and teeth．It may also help to protect the body against diseases such as diabetes and cancer．And now，researchers say vitamin D might help fight brain diseases called dementia （痴呆）．Dementia is a brain disease that damages thinking and memory processes，which scientists call"cognitive （认知） abilities．"Dementia is difficult to treat．Taking care of someone who has dementia is extremely demanding．And the disease is very frightening to sufferers．Chris Roberts suffers from dementia．He says the worst part of living with this disease was getting lost while driving．"The worst thing that I found was getting lost in the car，not just forgetting where I was going-I wouldn't know where I was．"More than 47million people around the world suffer from dementia．The World Health Organization reports that 60percent of them live in low-and middle-income countries．
We get vitamin D from some foods like nuts，lentils （扁豆） and fatty fish．We also get vitamin D from the sun．But that is not dependable．In some parts of the world，there is not enough sunlight to provide enough vitamin D．Also，sunblock prevents the vitamin from entering the body．To add to the problem，the skin's ability to process vitamin D weakens as a person ages．
Researchers at Rutgers University in New Jersey are exploring the relationship between vitamin D and dementia．The team recently measured vitamin D levels and cognitive ability in older people．Nutritional sciences professor Joshua Miller led the team．He said cognitive abilities differed among the study subjects．He said tests showed that about 60percent of the group was low in vitamin D．
32．Which of the following is true about vitamin D？B
A．Vitamin D can decrease people's risk of heart diseases．
B．Vitamin D helps the body fight against cancer．
C．Vitamin D is mainly obtained from the sun．
D．The need for Vitamin D decreases as people age．
33．What does the underlined word"demanding"mean in Paragraph 2？D
A．Boring but rewarding．
B．Disturbing and frightening．
C．Disgusting and stressful．
D．Hard and tiresome．
34．What does Paragraph 3mainly talk about？B
A．How vitamin D affects people's health．
B．Where people get vitamin D．
C．Whether sunlight can produce vitamin D．
D．Why people's age influences the production of vitamin D．
35．Where can we most probably read the passage？C
A．In a travel brochure．
B．In a literature magazine．
C．In a science journal．
D．In a commercial advertisement．
分析 本文讲述的是维生素D的用处以及可以获得途径．
解答 32．B细节理解题．根据第一段It may also help to protect the body against diseases such as diabetes and cancer．可知，维生素D可能会帮助人对抗疾病．故选B．
33．D词义猜测题．句意：照顾一个患有痴呆症的人是非常苛刻困难的．故选D．
34．B段落大意题．根据第三段的描述，可知我们可以从哪些地方获得维生素D．故选B．
35．C文章出处题．本文讲述的是维生素D的用处以及可以获得的途径．所以文章的出处最可能是科学杂志，故选C．
点评 本文是健康环保类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
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