us and down和ups and downs有什么区别?
题目
us and down和ups and downs有什么区别?
答案
换句话说,ups and downs就是起伏、波折.这是每个人都难免会遇到的.下面就是一个例子.例句-1:Mister White sure has had his ups and downs.He's made a fortune three times and then lost it all.But he doesn't ha...
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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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