(单选题)

The word "flag" in paragraph 2 is closest in meaning to: ( ).

A.mark

B.diminish

C.increase

D.signal

参考答案：B

参考解析：

定位到第二段Gallup estimates that the U.S. economy loses up to $550 billion per year when productivity flags as a result of unhappy employees.根据句意“盖洛普估计，当员工不开心导致生产力下降时，美国经济每年损失高达5500亿美元”，可知划线词在这里描述的是生产力的下降、减弱或者衰退。选项A：标记；选项B：减少；选项C：增加；选项D：标志。故本题正确答案选B。

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