节约 英语作文
题目
节约 英语作文
提示 1 save water 2 ride abike to school 3 recycle the paper 4turn off lights 5 try not to use plastic bags 60词左右
答案
It is our duty to protect our environment. Being a memember of the society we should save everything. Firstly, we should save wather. We should turn off the tap in time and reuse the water. Secondly, ...
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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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