题目

已知 、b互为相反数，m、n互为倒数，x的绝对值为2 ，则 =. 答案：【1】-6短文改错假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有1 0处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。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。One Tuesday afternoon, we were playing the basketball on the playground while I all of a sudden slipped and fell over. On seeing that, all my classmates rushed to me. With the help of several others students, Li Xiang, one of my best friend put me on his back and headed for the clinic at no time. It turned out that my right ankle got spraining so I had to be sent to hospital. Not until the ambulance arrived he leave. The following day, he came to see me. To my greatly relief, he brought textbooks with them and helped me with my lessons. It was a great pleasure to have such a devoting friend.