Then if the host or hostess or both of them come in a car to get their guest for dinner,the guest sh
题目
Then if the host or hostess or both of them come in a car to get their guest for dinner,the guest should sit in the front seat and leave the back seat empty though there is no people sitting on it
答案
然后如果主人用车去接客人来参加宴会,客人应该坐在前排的座位上,即使后排没有人坐也必须空出来
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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