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最佳答案：Einstein's leading contribution of the theory of relativity is that it has chang
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最佳答案：I like chemistry, because chemistry class , there are many interesting experimen
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最佳答案：to make a knowledge of color,at the very time we arrive at the world and open ou
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最佳答案：End of the second world war,Ernest Hemingway,moved to Cuba,know the old fisherma
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最佳答案：Faced with the rapid development of science and technology challenges,we need to