写一篇《My Favourite Invention》英语作文【八年级】
题目
写一篇《My Favourite Invention》英语作文【八年级】
答案
There are many inventions in the world,but my favorite invention is the computer.As a student the computer helps me a lot.With the computer,I can find lots of information I need .I can read books,know the latest news and watch movies.I can play games or listen to music when I am tired.It is easy to communicate with my friends.I often chat with them through e-mails and QQ.I think in the future ,the computer will be used by everyone.
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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