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The behavior gap between rich and poor children, starting at very early ages, is now a well-known piece of social science. Entering kindergarten, high-income children not only know more words and can read better than poorer children but they also have longer attention spans, better-controlled tempers and more sensitivity to other children. 从很小的时候，富孩子和穷孩子就出现了行为差距。在这方面，一篇相关的社会科学论文现已变得众所周知。走进幼儿园，你会发现富孩子不仅比穷孩子认识更多的字，阅读能力更强，而且拥有更长的注意力周期，能够更好地控制脾气，对其他孩子更加敏感。 All of which makes the comparisons between boys and girls in the same categories fairly striking: The gap in behavioral skills between young girls and boys is even bigger than the gap between rich and poor. 所有这一切使得同一个类别中男孩和女孩的比较更加引人注目：小女孩和小男孩的行为技能差异甚至比富孩子和穷孩子的差异还要大。 By kindergarten, girls are substantially more attentive, better behaved, more sensitive, more persistent, more flexible and more independent than boys, according to a new paper from Third Way, a Washington research group. The gap grows over the course of elementary school and feeds into academic gaps between the sexes. By eighth grade, 48 percent of girls receive a mix of A’s and B’s or better. Only 31 percent of boys do. | 
