题目

下列命题是真命题的是(    )A．过一点有且只有一条直线与已知直线平行B．两条直线被第三条直线所截，内错角相等C．过一点只能画一条直线D．两点之间，线段最短 答案：D解析:A、如果这一点在这条直线上，这个命题就不成立，是假命题；B、两条直线平行的情况下，内错角相等，这个命题不成立，是假命题；C、过一点能画无数条直线，这个命题不成立，是假命题；D、是真命题，故选D.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10处语言错误，每句中最多两处。错误涉及一个单词的增加、删除或修改。增加: 在此处加一个漏词符号（∧），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11处起）不计分。Since my childhood, libraries had played an important role in my life. When I was a pupil, I regarded on my every trip to the school library as an adventure. I enjoyed my stay at the library when I could read various book I was interested in. It was for this reason why I decided to volunteer at a library. At first I had difficulty remember where each book should be shelved, and I got used to doing so soon with the help of a kind librarian. Working in the library might seem bored for most people. However, it was rewarding experience for me. It not only developed my ability to read, but also help me make a contribution to society.