题目

一个足球运动员用100N的力踢一个重为5N的足球，球离脚后在水平草地上向前滚动了30m．在球滚动的过程中，运动员对足球做的功为（ ）A．3000JB．500JC．150JD．0J 答案：D解析:略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10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汇。2. 只允许修改10处, 多者(从第11处记)不计分。One day, it is so hot that my parents and I went to Changli Park to enjoy the shade. On the way, I found I had forgotten to bring my cell phone with me, but I returned for them. Reach my home, I noticed one of the window wide open. “My parents aren’t at home. Who can it be?” I wondered. I walked to a window, looked through it and to my surprise, finding two strangers were trying to open a case. I was so frightening at the sight that I couldn’t say a word. I left there in silence without noticed. Then I phoned the police for help. Five minutes later, three policemen appeared and caught up the two thieves.