29.People caused a lot of water________,and the ______water did harm to their health.A.pollute,pollu
题目
29.People caused a lot of water________,and the ______water did harm to their health.A.pollute,polluted B.pollution,polluting
C.pollution,polluted D.pollute,polluting
38.This boy is very clever.He had the girl ________ her toy _____ his candy.
A serving,for B exchange,for C exchanging,with D serve,as
选哪个?THX!
答案
water pollution; the polluted water
exchange for
第一个是水污染,应该用污染的名词形式.
第二个是过去分词做形容词,表示被污染的水
had somebody do something
因此要用动词原形.exchange sth for sth.表示用某物交换某物
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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