Some people like to play games by themselves,but some enjoys watching others___
题目
Some people like to play games by themselves,but some enjoys watching others___
A.happy B.strong C.interesting D.tired
答案
A
有些人喜欢亲自玩游戏,但有些人却乐意看别人（玩得）开心.
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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