Key middle school students are higher than common middle school students on evaluation, flexibility and independence.

但重点中学在评价性、灵活性和独立性上显著高于普通中学。

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There was no statistical significance between students from key middle school and common middle school or between rural students and urban ones.

重点中学与非重点中学学生、城镇生源与农村生源中学生的社会责任心水平差异均无统计学意义；

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Failing the common problems in the chemical curriculum in the senior middle school, I suggest to optimize the structure of the chemical curriculum, which include its form and substance.

本文针对我国普通高中化学课程现存的问题，提出普通高中化学课程结构优化应包括形式结构和实质结构优化两方面。

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When my son entered his new middle school my wife and I were faced with a very an ethical situation common to parents today: do we bow down to the evil forces of society, technology and popular culture and get him a cell phone?

FORBES: Amazon's New Kindle: It's Just Old School