精品英语四级考试备考复习资料汇总.doc
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1、英语四级考试备考复习资料汇总英语已经融入我们生活当中,是新时代人类不可或缺的的一门语言。学习英语的人越来越多,为了找个方便高效的英语学习方法,而找英语教练给予帮助。下面是小编为大家整理的有关英语四级考试备考复习资料汇总,希望对你们有帮助!英语四级考试备考复习资料汇总1:阅读练习题There is evidence that the usual variety of high blood pressure is, in part, a familial disease. Since families have similar genes as well as similar environmen
2、ts, familial diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of oneenvironment factor commonly shared by families, namely dietary salt (i.e., sodium chloride), has been studied at Brookhaven National Laboratory. These studies
3、suggest that long excess salt intake can lead to high blood pressure in man and animals. Some individuals, however, and some rats consume large amounts of salt without developing high blood pressure. No matter how strictly all environmental factors were controlled in these experiments, some salt-fed
4、 animals never developed hypertension whereas a few rapidly developed very severe hypertension followed by early death. These marked variations were interpreted to result from differences in genetic constitution.By mating long successive generations of those animals that failed to develop hypertensi
5、on from salt intake, a resistant strain (the R strain) has been evolved in which consumption of large quantities of salt fails to influence the blood pressure significantly. In contrast, by mating only animals that quickly develop hypertension from salt, sensitive strain (the S strain) has also been
6、 developed.The availability of these two strains permits investigations possible. They provide a plausible laboratory model on which to investigate some clinical aspects of the human hypertension. More important, there might be the possibility of developing methods by which genetic susceptibility (敏
7、感性) of human beings to high blood pressure can be defined without waiting for its appearance. Radioactive sodium 22 was an important tool in working out the characteristics of the sodium chloride metabolism.21. The study of the effects of salt on high blood pressure was carried out_.A. as members of
8、 the same family tend to use similar amounts of saltB. to explore the long-term use of a sodium based substanceC. because it was proven that salt caused high blood pressureD. because of the availability of chemically pure salt and its derivatives22. The main difference between S and R rats is their_
9、.A. need for sodium 22 B. rate of matingC. reaction to salt D. type of blood23. We can infer from the article that sodium 22 can be used to_.A. control high blood pressureB. cure high blood pressure caused by saltC. tell the S rats from the R ratsD. determine what a sodium chloride metabolism is lik
10、e24. The most beneficial results of the research might be_.A. development of diets free of saltB. an early cure for high blood pressureC. control of genetic agents that cause high blood pressureD. the early identification of potential high blood pressure victims25. Which of the statements best relat
11、es the main idea of this article?A. When salt is added rats and human beings react similarly.B. The near future will see a cure for high blood pressure.C. The medical field is desperately in need of research.D. A tendency toward high blood pressure may be a hereditary factor.21. A 22. C 23. D 24. D
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