Which of the following statements about labor unions can be concluded based on the information in the passage?
此题是对主题思想的推理判断。其中concluded．．．based on the passage为关键词语。它要求读者避开过于细节性的选择，也不能选择过于笼统的答案，致使选项中包含的内容超越文章的范围。读者应抓住情节用排除法将与文章不相干的A(1986's工会鼎盛)，C(不关心工人福利)，D(未达成一致奋斗目标)选项排除掉。只有B项“工会经过多年(1869-1930)努力奋斗才改善了工人的工作条件”与文章内容一致。
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