why children should be protected and controlled
题目
why children should be protected and controlled
答案
为什么儿童应该被保护和控制?好难回答..Because they are the future of our motherland and hope We know that children at a very young age on the outside is no gossip for judgment,we should guide them towa...
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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