以 How to Keep US Safe的作文
题目
以 How to Keep US Safe的作文
答案
How to Keep Safe on the Way to School In our communities now, we often walk, bike, or drive to school. But how can we keep ourselves safe? If we walk, the cars and the street gangs might cause us ...
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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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