1.Have you ever stuck in a traffic jam?2Where were you going?3How long were you in the jam?4.What di
题目
1.Have you ever stuck in a traffic jam?2Where were you going?3How long were you in the jam?4.What did you do then?5.If you haven’t met a traffic jam ,canyou imagine what will happen in it?
答案
1.Yes,I have.2.I was on my way home.3.About an hour.4.Waited5.Go home earlier
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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