once he makes up his mind to do something,no one can hold him back
题目
once he makes up his mind to do something,no one can hold him back
答案
一旦他下定决心做一件事,没有人能够阻止他
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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