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：把多余的词用斜线（\）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：1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第11处起）不计分。
Last Sunday, sixty students from our school pay a visit to China Science and
Technology Museum. The museum, which main task is to spread the knowledge of science and technology, covering an area of 48000 square meters. The moment when we entered the museum, the exhibition caught their attention. In the museum, we saw the latest progresses in science and technology. Moreover, we did an amazed scientific experiment by ourselves. What appealed us most was the 3D film that made us feel we were in real events.
Though the visiting time was slight short, we gained a lot. It is so an instructive activity that we hope more will be organized in the future.
