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：在错的词下划一横线，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。
After a plane crashed in South China on March 21st, rescued workers managed to find two black boxes. The black boxes may provide the key to understand why the plane crashed. When black boxes are recovered in well condition, investigators (调查员) can analyze and produce a report on their content for about three months, but it can take much longer when they are damaged, said Li Xiaojin, a professor from the Civil Aviation University of China. One of the black box from the crashed Flight MU5735 was found on March 23rd. The second black box is recovered on March 27th. The black boxes are not black. Therefore, they are painted bright orange to aid in their recovery after accidents. They are usually placed in the tail of a plane, which they are more likely to survive a crash. It can work for 30 days without any electricity.
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。
Sometimes I get the feeling when living in a city makes people much lonely than before. People always feel stranger cannot be trusted. And that is not normal to start talking to anyone or even smile at someone. I want change this. Last week, I went skating. A man ran by smile. He said something to us about doing sports and that he hoped to be able to finish his run. I smiled back and said that he certain would. And today, a family cycled by when I am in the park. One of the girls waved at me with a smile, and I waved back enthusiastically. I believe such small gestures can change into the world we live in.
