求120词英语写保护环境的作业 具体一点的
题目
求120词英语写保护环境的作业 具体一点的
答案
The environmental pollution ismore and more seriously today .Water is polluted we have no clean water to drink Many trees are cutting down some animals is getting less and less.Some factories is porin...
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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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