增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词；
删除：把多余的词用(\)划掉；
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：
⒈每处错误及其修改均仅限一词；
⒉只允许修改5处，多者(从第6处起)不计分。
Cheer-leading began in all-men colleges in late nineteenth and early twentieth centuries. As time passes, more and more colleges started cheer-leading and more women started doing it. It was not until the 1920s when pompoms began to play an important part in cheer-leading. At about the same time, cheerleaders began to include gymnastics in their routines. Found at most athletic events, and cheer-leading competitions are an important part of school and college life. Nowadays, many American are amused by cheer-leading.
