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  3. Alzheimer’s disease has no cure. There are, however, five drugs—known and ap

Alzheimer’s disease has no cure. There are, however, five drugs—known and ap

游客2024-09-22  49
问题     Alzheimer’s disease has no cure. There are, however, five drugs—known and approved—that can slow down the development of its symptoms. The earlier such drugs are administered, the better. Unfortunately, the disease is usually first noticed when people complain to their doctors of memory problems. That is normally too late for the drugs to do much good. A simple and reliable test for Alzheimer’s that can be administered to everybody over the age of about 65, before memory-loss sets in, would therefore be useful.
    Theo Luider, of the Erasmus University Medical Centre in Rotterdam, and his colleagues think they have found one—but it works only in women. They made their discovery, just reported in the Journal of Proteome Research, by tapping into a long-term, continuing study that started in 1995 with 1,077 non-demented and otherwise healthy people aged between 60 and 90. At the beginning of the project, and subsequently during the periods 1997-99 and 2002-04, participants were brought in for a battery of neurological(神经学的)and cognitive investigations, physical examinations, brain imaging and blood tests.
    During the first ten years of the study, 43 of the volunteers developed Alzheimer’s disease. When Dr. Luider compared blood samples from these people with samples from 43 of their fellow volunteers, matched for sex and age, who had remained Alzheimer’s-free, he found something startling. Levels of a substance called pregnancy zone protein had been unusually high, even before their symptoms appeared, in some of those who went on to develop Alzheimer’s disease.
    Those "some" , it turned out, were all women. On average, levels of pregnancy zone protein in those women who went on to develop Alzheimer’s were almost 60% higher than those of women who did not. In men, levels of the protein were the same for both.
    The reason for this curious result seems to be that the brain plaques(斑块)associated with Alzheimer’s disease are themselves turning out pregnancy zone protein. Certainly, when Dr. Luider applied a chemical stain specific to that protein to the plaques of dead Alzheimer’s patients he found the protein present in them.
    Confusingly, though, it was there in the plaques of both sexes. Presumably, female cells(and therefore the plaques of female brains)make more of it than male cells do. But that remains to be proved. Whatever the reason, however, this result means that women, at least, may soon be able to tell whether and when they are at risk of Alzheimer’s—and thus do something about it before they start losing their minds. [br] What can we learn from the first paragraph?
选项 A、No medication can slow down the development of Alzheimer’s symptoms.
B、People who always complain are most likely to have Alzheimer’s disease.
C、Doctors had better tackle Alzheimer’s disease when people are 65 years old.
D、To detect Alzheimer’s disease before memory loss is crucial.
答案 D
解析 细节题。第一段最后一句提到，如果有一种简单、可靠的方法能在患者记忆力开始衰退之前检测出该病，并且适用于任何65岁以上的人，这种方法会大有裨益，所以[D]“在患者记忆力衰退之前诊断出阿尔茨海默病是很重要的”陈述正确，故为正确答案，同时可知[C]是对这句话字面意思的曲解，故排除；根据本段第二句可知，有五种药物可以减缓阿尔茨海默病症状的恶化，故排除[A]；[B]是对本段第四句“不幸的是，这一疾病往往是在人们向医生抱怨记忆力出现问题时才开始被注意到”字面意思的曲解，故排除。
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