People must be encouraged in their efforts and they should pride themselves on saving
题目
People must be encouraged in their efforts and they should pride themselves on saving
答案
必须鼓励人们的努力,同时他们应该为自己节约能源而感到骄傲
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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