found only in people with the disease. The protein tests correctly identify the presence of the disease in about ninety percent of patients.

　　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. Using this information, they developed a test in which people were asked to identify twelve familiar smells. These smells included cinnamon, black pepper, chocolate, paint thinner, 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. 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.

　　8．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.

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

　　A．100 million. B．25 million.

　　C．400 million. D．2,050 million.

　　10．What is not the early signs of the Alzheimer's disease according to the passage?

　　A．Poor memory.

　　B．Proteins exist in the brain.

　　C．Trouble with the sense of smell.

　　D．Less use of the brain.

　　11．What does the underlined word"it"in paragraph 1 refer to?

　　A．Alzheimer's disease. B．Alzheimer's patients.

　　C．The cause and the cure. D．The research.

　　课下能力提升(十三)

　　1．解析：选D　推理判断题。根据第二段中的"Born to a physiology (生理学) professor ... childhood at home."和"...he would perform experiments in his father's laboratory."可以判断出，父亲在尼尔斯对物理学的兴趣培养方面起到了帮助作用。

　　2．解析：选B　细节理解题。根据第三段可知，尼尔斯获得诺贝尔奖是由于他所提出的原子模型，该原子模型可以解释原子的所有性质。

　　3．解析：选B　细节理解题。根据第四段可知，尼尔斯从瑞典逃到了英国，英国鼓励原子弹研究，几个月后他加入一个英国研究小组去美国研究该课题，所以他是在美国研究原子弹的。

　　4．解析：选B　推理判断题。根据最后一段中的"He published ... get rid of nuclear (核的) weapons in the world."可知，尼尔斯请求联合国帮助消除世界上的核武器，由此可以推断出他认为研制核武器是错误的。