In some parts of the United States, farming is easy. But farming has always been difficult in the northeastern corner of the country, which is called New England.

　　⑱New England has many trees and thin, rocky soil. Anyone who has wanted to start a new farm there has had to work hard. The first job has been cutting down trees. The next job has been digging the stumps out of the soil. Then the farmer has had the difficult job of removing stones from his land.

　　⑲This work of removing stones never really ends, because every winter more stones appear. They come up through the thin soil from the rocks below. Farmers have to keep removing stones from the fields. Even today, farms which have been worked on for 200 years keep producing more stones.

　　⑰That is why stone walls are used instead of fences around New England fields. The stone walls are not high; a man can easily climb over them. ⑳But they keep the farmers’ cows from joining their neighbors’ cows.

　　1~5.AACBC

　　6~10.BABCA

　　11~15. CBCBC

　　16~20.BCAAC21.【解析】选Ａ。考查冠词。句意：我们正在不遗余力地创造一个更加和平发达的世界，一个人人都可以享受生活和自由的地方。不定冠词表示泛指。

　　【知识拓展】冠词的位置

　　在通常情况下，冠词放在名词前，若名词前带有形容词等修饰语，它则放在相应的修饰语前。例如：

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