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  3. It is common for older people to forget things. Now an American study has found that memory starts to fail when we are young adu

It is common for older people to forget things. Now an American study has found that memory starts to fail when we are young adu

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问题     It is common for older people to forget things. Now an American study has found that memory starts to fail when we are young adults. People younger than thirty usually do not know that they are starting to forget information. But scientists from the University of Michigan say the loss of memory usually has already started.
    Researchers say people do not observe this slow reduction in mental ability until the loss affects their everyday activities.
    Denise Park is leading the new study. She directs the Center for Aging and Cognition at the Institute for Social Research at the University of Michigan. Her team has studied more than 350 men and women between the ages of twenty and ninety. The study has identified people in their middle twenties with memory problems.
    She says young adults do not know that they are forgetting things because their brains have more information than they need.
    But she says that people in their twenties and thirties are losing memory at the same rate as people in their sixties and seventies.
    Ms. Park says people between the ages of sixty and seventy may note the decrease in their mental abilities. They begin to observe that they are having more trouble remembering and learning new information.
    The study has found that older adults are more likely to remember false information as being true. For example, they remember false medical claims as being true. Younger people remember hearing the information, but they are more likely to remember that it is false.
    Ms. Park is now using modem imaging equipment to study what happens in the brains of people of different ages. She is studying what parts of the brain older adults use for different activities compared to younger adults. Ms. Park says mental performance is a direct result of brain activity and brain structure. She says older people should take part in activities that keep their brain active. She hopes that future studies will identify ways to improve the operation of our aging minds.
The passage is meant to______.
选项 A、introduce effective ways to improve memory
B、emphasize the importance of exercising the brain
C、analyze the difference between different age groups in the loss of memory
D、reveal the decrease in mental ability of the young adults as well as the older adults
答案D
解析 本题为主旨题。要确定本文的目的是什么。选项A．introduce effective ways to improve memory虽然在文章中有所提及，但并不是本文的主要目的；选项B．emphasize the importance of exercising the brain意为“强调锻炼大脑的重要性”，虽然文章提到对大脑的锻炼，但并没有用较大篇幅强调其重要性；选项C．analyze the difference between different age groups in the loss of memory意为“分析不同年龄组在记忆减退方面的差异”，而此文目的并非在此，因此不正确。文章主要说明了“年轻人从20多岁开始记忆力就会逐步减退”这一主题。因此选项D．reveal the decrease in mental ability of the young adults well as the older adult才是本文的主题。
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