以What do you usually do this summer vacation?为主题写一篇作文
题目
以What do you usually do this summer vacation?为主题写一篇作文
答案
Summer vacation is a wonderful time for me to relax. I usually do a lot of things to enrich my vacation. I enjoy playing computer games with my friends and sometimes we meet together to have a chat ab...
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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