问题补充：
Alzheimers disease 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. That would be four times the current number. Researchers and doctors have been studying Alzheimers 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.
Several early signs of the disease involve memory and thought processes. 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 Alzheimers disease. The tests look for proteins in brain and spinal cord fluid. The proteins appear to be 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 Alzheimers risk has been developed. Researchers found that trouble with the sense of smell can be one of the first signs of Alzheimers. 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 persons chances of developing Alzheimers disease in old age. Researchers in Chicago found that people who use their brains more often are less likely to develop Alzheimers 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 Alzheimers 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 Alzheimers disease.
B. Some physical tests about Alzheimers disease.
C. The research about Alzheimers disease.
D. The patients of Alzheimers disease.
42. What’s the current number of Alzheimer’s patients?
A. 100 million B. 25 million C. 400 million D. 2050 million
43. What is not the early signs of the Alzheimers 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.
44. What does the underlined word “it” in paragraph 1 refer to?
A. Alzheimers disease. B. Alzheimers patients. C. The cause and cure. D. The research.
45. According to the passage, we can learn that .
A. there are no proteins in the brains of the people with no Alzheimers disease
B. the people who often use their brains will not get Alzheimers disease
C. researchers and doctors have found ways to cure Alzheimers disease
D. the people who have the trouble with the sense of smell will certainly suffer from Alzheimers disease41. C 42. B 43. D 44. A 45. A
答案：
(答案→)41. C 42. B 43. D 44. A 45. A
解析：41. 主旨大意题。根据全文所讨论的内容得知，选项A, B, D选项在文章中有讨论过, 但不全面。
42. 细节理解题。由第一段第二,第三行可知:到2050年老人痴呆症病人的人数会达到100 million, 也就是现在的4倍,现在的人数就是25 million。
43. 细节理解题。A, B, C都是老人痴呆症的早期特征, D项指少用脑只会更容易得老人痴呆症, 而不是它的早期特征。
44. 词义猜测题。根据上文和此句的意义可知答案。
45. 推理判断题。由第三段The proteins appear to be found only in people with the disease可
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