【单选题】

In the third paragraph, "a dual function" refers to ______.
A．formal and informal

B．rewards and penalties
C．approval and disapproval
D．clarification and regulation

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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

19%的考友选择了B选项

2%的考友选择了C选项

70%的考友选择了D选项

In the third paragraph, "a dual function" refers to ______.A．formal and informal