The study continued for five years. During this period, the same people were asked to take several tests measuring their memory and thought abilities. Fifty percent of those who could not identify at least four of the smells in the first test had trouble with their memory and thinking in the next five years.

　　Another study has shown a possible way to reduce a person's chances of developing Alzheimer's disease in old age. Researchers in Chicago found that people who use their brains more often are less likely to develop Alzheimer's disease. Those who read a newspaper, or play chess or word games are about three times less likely to develop the condition.

　　Researchers say they still do not know what causes Alzheimer's disease. But they say these findings might help prevent the disease in the future.

　　41．What's the main idea of the passage?

　　A．Some early signs of the Alzheimer's disease.

　　B．Some physical tests about Alzheimer's disease.

　　C．The research about Alzheimer's disease.

　　D．The patients of Alzheimer's disease.

　　【答案与解析】　C　主旨题。根据全文所讨论的内容得知，选项A、B、D三项在文章中有讨论过， 但不全面。

　　42．What's the current number of Alzheimer's patients?

　　A．100 million.

　　B．25 million.

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