Breakfast is important的英语作文 80词
题目
Breakfast is important的英语作文 80词
答案
A good breakfast is important.We can easily understand why.We have not eaten anything for about twelve hours by breakfast time.Our bodies need food for morning activites.One good breakfast should be r...
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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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