关于水的英语小作文
题目
关于水的英语小作文
答案
Water
Water is a clear,clean fluid.Water is useful.We drink water everyday.We use water everyday to do washing,too.Our life could not do without water.Water is a valuable resource.Many countries and areas are short of water.We should use less water each day to save the planet.
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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