8.－You looked very tired this morning.What did you do yesterday afternoon?
题目
8.－You looked very tired this morning.What did you do yesterday afternoon?
－I did ___ Christmas shopping.
A.a lot of B.a few of C.a number of D.a piece of
想问问这四个词怎么区别,
答案
A a lot of =some
b a few 没有 a few of 的词组
C a number of 相当于 many,修饰可数名词复数
D a piece of 一片 一张
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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