增加：在缺词处加一个漏字符号(∧)，并在其下面写出加的词。 删除：把多余的词用斜线(/)划掉。 修改：在错的词下画一横线，并在该词下面写出正确的词。 注意：1.每处错误及其修改均仅限一词；只允许改10处，从第11处起不。 Yesterday a schoolboy is daydreaming in class. With realizing what he was doing, he put a pen cap into his mouth. A few minutes late, he was terrified to find that he had swallowed it! The teacher was shocking when the boy stood up and said, “I have just swallowed a pen cap.” He was quickly sent the nearest hospital. There a doctor examined him and said the best treatment was to take some medicines so that the pen could pass natural. Three hours later, the boy successfully made it. “She is really lucky.” said the doctor. “It’s not rare that small children put things into their mouths for a fun. It is very danger.”[