The boy is twelve years old and he is one of the best students in his class
题目
The boy is twelve years old and he is one of the best students in his class
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答案
The boy who is one of the best students in his class is twelve years old.
举一反三
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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