【单选题】
The passage mainly discusses ______.
A.the differences in average income among countries
B.the relationship between productivity and living standards
C.the causes of the rise in living standards
D.the importance of raising productivity
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根据网考网移动考试中心的统计,该试题:
5%的考友选择了A选项
65%的考友选择了B选项
1%的考友选择了C选项
29%的考友选择了D选项