at the age of的造句
题目
at the age of的造句
答案
She graduated from the high school at the age of 18.
She had her first boy friend at the age of 20.
She became a famous singer at the age of 23.
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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