A:who____the washing machine ______?B:It was invented by Fisher.A .was;invented B.was;invented by
题目
A:who____the washing machine ______?B:It was invented by Fisher.A .was;invented B.was;invented by
这个题该选哪一个?
答案
选B
Who was the telephone invented by?It was invented by Bell.
电话是谁发明的?电话是贝尔发明的.
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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