题目内容
踏步打鼓的动作,膝盖要绷直。
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踏步打鼓的动作,肩膀不能倒下来。
3 、The effect is so great that researchers from the Universityof Bristol said those children with a “healthier”diet mayget an IQ boost.
翻译：1、Children brought up on healthy diets are more intelligentcompared with their junk food eating counterparts，newresearch suggests.
Meselson和Stahl利用14N及15N标记大肠杆菌的实验证明的反应机理是
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