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最佳答案:We conclude that the two substances combined to form new substances.
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最佳答案:The material needs of people are increasing gradually
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最佳答案:我们的生活中处处都有爱.比如父爱、母爱、友爱等.只不过是粗心的我们常常把它们忽略罢了.下面便是生活中几个爱的精彩片段,也许它们是我们至今仍然在追忆、回味、感动、