1、C 原文第三段：“We can use only about one percent of the water on Earth.” one percent就是1%,所以选C
2、A 原文第四段：“Because most of the land there is not very rich” not very rich意思是不富裕,贫穷的意思,所以选A
3、D 原文第四段：“but it is difficult to farm in the tropics”,故选D
4、A 原文第二段：“ Most of the fresh water is snow and ice near the North and South Poles”,故选A
5、B 原文第四段：“ There is a lot of rain in the tropics”,故选B.
其实很多题都可以在文中找出答案的,要仔细看清楚题目以及文章,