关于handwariting is very important 的英文作文
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关于handwariting is very important 的英文作文
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it is important to learn English well.if we learn English well,we can talk with foreigners.so we cam tell them about Chinese culture.besides,if we learn English well,we will be able to do somethin
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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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