-----is known to all is that the Diaoyu Islands have belonged to China since ancient times.A.As B.It
题目
-----is known to all is that the Diaoyu Islands have belonged to China since ancient times.A.As B.It C.What D.That
答案
C what is known to all是主语从句,整个做主语,横线部分少从句的主语,所以用疑问代词what
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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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