如题：
题目
如题：
1.His sister went to school by bike yesterday.(对sister划线提问)
2.It often rains in summer.(对rains划线提问)
答案
1.Who went to school by bike yesterday?
2.What's the weather like in summer?
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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