第30题: [单项选择]Some psychologists argue that the traditional idea "spare the rod and spoil the child" is not rational. A. helpful B. kind C. sensible D. effective 参考答案:C 答案解析:[解析] rational合理的,理智的。helpful有益的;kind友善的,和蔼的;sensible明智的,合理的;effective有效的。故答案为C。