While Iwas reading a book,an alien came into my room.改为一般疑问句,要怎么改?
题目
While Iwas reading a book,an alien came into my room.改为一般疑问句,要怎么改?
While I was reading a book,an alien came into my room.
答案
Did an alien come into your room while you were reading a book?
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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