以How was the unmbrella invented?为题,写一篇英语作文80词
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以How was the unmbrella invented?为题,写一篇英语作文80词
以How was the unmbrella invented?为题,写一篇英语作文80词有关于雨伞的
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Tom's mother always said to him that he should help other people.A raining day,when Tom on the way home after school,he saw an old man was walking into rain without umbrella.Tom was so kind as to shar...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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