wordpress 4.5 多站点不同数据,重庆森林经典台词图片,道滘做网站,网页制作需要下载什么软件2017年大学英语四级精选试题练习勤奋和智慧是双胞胎#xff0c;懒惰和愚蠢是亲兄弟。以下是小编为大家搜索整理的2017年大学英语四级精选试题练习#xff0c;希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!1、Courses with the numbers 800 or above are…2017年大学英语四级精选试题练习勤奋和智慧是双胞胎懒惰和愚蠢是亲兄弟。以下是小编为大家搜索整理的2017年大学英语四级精选试题练习希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!1、Courses with the numbers 800 or above are open only to graduate students. Certain courses, generally those devoted to introductory material, are numbered 400 for undergraduate students and 600 for graduate students. Courses designed for students seeking a professional degree carry a 500 number for undergraduate students and a 700 munber for graduate students.A full-time graduate student is expected to take courses which total ten to sixteen credit hours. Students holding assistantships are expected to enroll for proportionately fewer hours. A part-time graduate student must register for a minimun of five credit hours.1. In order to be eligible to enroll in Mechanical Engineering 850, a student must be ________.a. a graduate studentb. a part-time studentc. a full-time studentd. an undergraduate student2. If an undergraduate student uses the number 520 to register for an accounting course, what number would a graduate student probably use to register for the same course?a. accounting 520b. accounting 620c. accounting 720d. accounting 8203. A student who register for eight credit hours is a ________.a. full-time studentb. graduate studentc. part-time studentd. non-degree student4. A graduate student may not ________a. enroll in a course numbered 610b. register for only one three-hour coursec. register for courses if he has an assistantshipd. enroll in an introductory course答案accb2、There is evidence that the usual variety of high blood pressure is, in part, a familiar disease. Since families have similar genes as well as similar environments, familiar diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of one environmental factor commonly shared by families, namely dietary salt (i. e., sodium chloride), has been studied at Brookhaven National Laboratory. These studies suggest that chromic excess salt ingestion 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 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 is successive generations only those animals that failed to develop hypertension from salt ingestion, a resistant strain (the RStrain) 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, a sensitive strain (S strain) has also been developed.The availability of these tow strains permits investgations not heretofore possible. They provide a plausible laboratory model on which to investigate some clinical aspects of the human prototypes of hypertension. More important, there might be the possibility of developing methods by which genetic susceptibility 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.1. The study of the effects of salt on high blood pressure was carried out ________.a. as members of 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 derivatives2. The main difference between SandR rats is their ________.a. need for sodium 22b. rate of matingc. reaction to saltd. type of blood3. We can infer from the article that sodium 22 can de used to ________.a. control high blood pressureb. cure high blood pressure caused by saltc. tell the Srats from theR ratsd. determine what a sodium chloride metabolism is like4. 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 victims5. Which of the statements best relates 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.答案acddd【2017年大学英语四级精选试题练习】相关文章
