how to save energy
题目
how to save energy
要做小报 题目是save energy 随便提供几个条款把 做小报的 各方面的节能都可以.是初中
答案
Nowadays, the world is facing the big problem of energy shortages. The energy that we can use is running out day by day. Maybe one day we will all end up drinking dirty water if we don't do something ...
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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