四级备考 六级备考 经验交流 模拟试题 历年真题 每日一练

消单词 精品试听 直播课程 名 师 热推课程

首页 > 备考辅导 > 四级备考 > 阅读 >

2019年6月四级仔细阅读精选:高血压

2019-02-10 17:01 来源:文都网校 阅读()

  2019年上半年英语四级考试时间是6月15日,你开始准备备考了吗?其中,四级仔细阅读占阅读部分的25%,要求考生阅读3篇短文,每篇长度为300-350词,每篇后有若干个问题,要求考生根据对文章的理解,从每题的四个选项中选择最佳答案。

  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 environments, familial diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of one environment factor commonly shared by families, namely dietary salt (i.e., sodium chloride), has been studied at Brookhaven National Laboratory. These studies 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 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 hypertension 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 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 the same family tend to use similar amounts of salt

  B. to explore the long-term use of a sodium based substance

  C. because it was proven that salt caused high blood pressure

  D. because of the availability of chemically pure salt and its derivatives

  22. The main difference between "S" and "R" rats is their_______.

  A. need for sodium 22 B. rate of mating

  C. reaction to salt D. type of blood

  23. We can infer from the article that sodium 22 can be used to_______.

  A. control high blood pressure

  B. cure high blood pressure caused by salt

  C. tell the "S" rats from the "R" rats

  D. determine what a sodium chloride metabolism is like

  24. The most beneficial results of the research might be_______.

  A. development of diets free of salt

  B. an early cure for high blood pressure

  C. control of genetic agents that cause high blood pressure

  D. the early identification of potential high blood pressure victims

  25. 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.

  参考答案:21. A 22. C 23. D 24. D 25. D

  以上就是小编为大家提供的英语四级仔细阅读精选练习。考生们想了解更多四六级备考课程、备考资讯,请点击文都网校四六级资讯站查询!有问题找文都☞☞☞详情咨询入口>>>

2018年12月大学英语四级作文真题

(点击图片进入专题>>)

   课程推荐

2019年6月四六级全程班

2019年6月大学英语四级全程班

2019年6月大学英语六级全程班

2019年6月四六级热门课程

2019年6月大学英语四六级实力抢分班

2019年6月大学英语四六级5天串记500词

2019年6月大学英语四六级过关规划课

     编辑推荐

备考交流
2019年英语四六级考试内容详解(笔试+口试)
备考2019年:英语四六级考试寒假复习计划
2019年英语四六级口语考试内容及流程详情

2019年英语四六级听力该做什么准备呢

责任编辑:wy

大学英语四六级网上课程热报班次

次名称 班次特点 活动

2019年6月大学英语四级全程班

课程构成:前基础阶段+基础阶段+强化模块阶段+真题解析冲刺阶段

课程特色:PC端、移动端、无有效期内自由看。

¥150
2019年6月大学英语六级全程班 ¥150
>>>查看更多四六级课程<<<

四六级免费在线咨询

文都四六级交流群

文都四六级QQ群437058182486117399517034650

 

上一篇:2019年6月四级仔细阅读精选:不同专业毕业生收入

下一篇:最后一页

关注官方微信
0元领取学习资料