感恩父母英语作文
题目
感恩父母英语作文
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Last week our music teacher taught us a song, named Indebted Heart. Through it I know that we should live with a thankful heart. At that time, I think of my parents. I think they are the first people ...
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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