What is it to be a good person 75个单词
题目
What is it to be a good person 75个单词
答案
A good person must have a kind mind.He should try to help others with pleasure.Of course,a kind mind is not enough.He must be a person who love life so much,that he will be enthusiastic to the things....
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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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