大学英语四级阅读训练试题附答案解析40篇(32)_大学英语阅读

　　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 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

　　2.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

　　3.We can infer from the article that sodium 22 can de 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

　　4.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

　　5.Which of the statements best relates the main idea of this article?

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