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Kids from different economic backgrounds behave differently in classrooms. 来自不同经济背景家庭的孩子们，在教室里的表现也不尽相同。 For example, working class kids are less likely to ask for help from teachers than are their middle class counterparts. And when they do ask for help, they're less aggressive about it. 比如，相比来自中产阶级家庭的孩子，来自工人阶级家庭的孩子不太可能寻求老师的帮助。而当他们确实需要帮助的时候，他们对求助也不是很有积极性。 That's according to a study that followed students from the third grade through the fifth, published in the journal American Sociological Review. 这是根据一项针对三年级到五年级的学生、发布在《美国社会科学回顾》杂志上的研究得出的。 | 
