六级冲刺练习阅读（119）_大学英语阅读

　　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?

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