how to ba a greener person 英语作文80词
题目
how to ba a greener person 英语作文80词
答案
As is known for all that global warming is one of the greatest challenges to the human race,one may ask can an ordinary person do anything to help?The answer is yes,you can.Every one can does something to help by leading a greener life.We can start from saving energy by choosing the energy saving bulb,using public tranportation.Only use airconditioner when it is most needed and never leave it on when you are not using it.You can become a greener person as long as you pick this green habit.
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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