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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.
With regard to memory reduction, young adults differ from older adults in that______.
选项 A、they lose their memory at a slower rate
B、their brains can store much more information
C、they rarely realize they have memory problems
D、they are more likely to remember false information
答案C
解析 本题为细节题。要确定在记忆力衰退的问题上，年轻人与老年人的主要区别是什么。根据文章第五段“But she says that people in their twenties and thirties are losing memory at the same rate as people in their sixties and seventies．(但是她说人类记忆力衰退在其二、三十岁时和其六、七十岁时的速度是一样的。)”可以排除选项A．they lose their memory at a slowerrate；根据文章第四段的“…because their brains have more information than they need．”可以看出选项B．their brains can store much more information是不正确的，因为不是能够储存得更多，而是多到不需要的地步。从文章倒数第二段的“The study has found that older adults are more likely to remember false information as being true．”可以看出选项D．they are more likely to remember false information是老年人的问题，而不是青年人的问题。文章第一段的“Peopleyounger than thirty usually do not know that they are starting to forget information．”与选项C．they rarely realize they have memory problems一致，说明年轻人意识不到自己记忆力的减退。所以选项C是正确答案。
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