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The gold standard study by Harvard and Columbia University scholars found that even in high-poverty schools, teachers consistently had a huge positive or negative impact.
2016年6月六级真题（第一套）阅读 Section C
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。