单项选择题

It is implied that 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
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单项选择题
Among the results of the research discussed in this article, the most beneficial might be ______.
A．the early identification of potential high blood pressure victims
B．development of diets free of salt
C．an early cure for high blood pressure
D．control of genetic agents that cause high blood pressure
单项选择题
The study of the effects of salt on high blood pressure was carried out ______.
A．because 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 proved that salt caused high blood pressure
D．because of the availability of chemically pure salt and its derivatives
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