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  3. Alzheimer’ s Disease Alzheimer’s disease (阿尔茨海默症，又叫老年痴呆症) affects millions of people around the world. American researchers s

Alzheimer’ s Disease Alzheimer’s disease (阿尔茨海默症，又叫老年痴呆症) affects millions of people around the world. American researchers s

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问题                         Alzheimer’ s Disease
   Alzheimer’s disease (阿尔茨海默症，又叫老年痴呆症) affects millions of people around the world. American researchers say the disease will affect more than one hundred million people worldwide by the year twenty fifty. 【B1】______
   Researchers and doctors have been studying Alzheimer’ s patients for a century. Yet the cause and cure for the mental sickness are still unknown. However, some researchers have made important steps towards understanding it.
  【B2】______At first, patients have trouble remembering little things. Later, they have trouble remembering more important things, such as the names of their children.
   There are also some physical tests that might show who is at risk of developing Alzheimer’ s disease. The tests look for proteins (蛋白质) in brain and spinal cord. The proteins appear to be found only in people with the disease. 【B3】______
   Now, a much simpler physical test to predict Alzheimer’ s risk has been developed. Researchers found that trouble with the sense of smell can be one of the first signs of Alzheimer’ s.【B4】______These smells included cinnamon(肉桂) , black pepper(黑胡椒) , chocolate, paint thinner (涂料稀释剂) , and smoke.
   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.【B5】______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.
   A. That would be four times the current number.
   B. The protein tests can correctly identify the presence of the disease in about ninety percent of patients.
   C. It’ s important to recognize the symptoms of Alzheimer’ s disease.
   D. Researchers in Chicago found that people who use their brains more often are less likely to develop Alzheimer’s disease.
   E. Several early signs of the disease involve memory and thought processes.
   F. Using this information, they developed a test in which people were asked to identify twelve familiar smells.
【B1】
选项
答案A
解析 第一段介绍了全世界的阿尔茨海默病患者的人数，空格前的内容讲到2050年，患病人数将达到1亿，而选项A“That would be four times the current number．”在结构和内容上均与该句子相关联，其中的“That”指代的是到2050年全世界的阿尔茨海默病患者。因此选项A为应填句子。
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