英语六级

单选题One reasonable explanation for the research results may be __

A. employers found some qualitative flaw in the longer-term unemployed
B. people make less effort to find work as their unemployment time lengthens
C. lengthening unemployment is equated with failing productivity
D. call-back rates declined clearly when higher unemployment prevailed

参考答案:C进入在线模考
细节题。根据题干关键词定位到第四、五段。本题要求找出能够合理解释实验结果的选项。由第五段的第一、二旬可以得出C项“长时间失业等同于工作效率的下降”符合题意。因此,正确答案是C。