公共英语考试

【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

网考网参考答案：C
网考网解析：
[精解] S是sensation，R是resistant，对象是salt，所以答案是[C]。 查看试题解析出处>>