用英语来描写开学第一天,
题目
用英语来描写开学第一天,
答案
How quickly time has flown by!My summer holiday is over.Our school is much more beautiful than before.The grass in front of the office building is so green.The river beside it is so clean and the tree...
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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