英语说明文：介绍一种物品.10月21日要
题目
英语说明文：介绍一种物品.10月21日要
英语，150字左右
答案
As we all know,TV is an important assistant in our dailiy life.Not only can we watch all kinds of programes from it,but also we can learn much knowledge by watching TV.It is a technical device playing an imprtant role in our entertainment time .TV has experienced a long development period from black-and-white to colorful nowadays .It is a witness of times.As to our sudents,we should prevent ourselves from being addicted to TV,but some attention paid to it is still needed.
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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