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TPO是我们常用的托福模考工具,对我们的备考很有价值,下面小编给大家带来托福阅读TPO16(试题+答案+译文)第2篇:Development of the Periodic Table。
托福阅读原文
The periodic table is a chart that reflects the periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number (the number of protons in the nucleus). It is a monumental scientific achiev
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