单选题
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
【正确答案】
C
【答案解析】
[精解] S是sensation，R是resistant，对象是salt，所以答案是[C]。
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