The Great Wall was made of stones and bricks.There are huge stones on _____ side and on the highest
题目
The Great Wall was made of stones and bricks.There are huge stones on _____ side and on the highest part.
A both B all C each 选哪个?为什么?
答案
C.each
因为both+名词复数,表示 两者都;
all+名词复数,表示 三者以上全都
each +名词单数;
这里each+side 每一边
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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