题目

高楼坠物危害极大，常有媒体报道高空坠物伤人的事件。某建筑工地突然有一根长为l的直钢筋从高空坠下，垂直落地时，恰好被检查安全生产的随行记者用相机拍到钢筋坠地瞬间的照片。为了查询钢筋是从几楼坠下的，检查人员将照片还原后测得钢筋的影像长为L，且L>l，查得当时相机的曝光时间为t，曝光时间极短，楼房每层高为h，重力加速度为g。则由此可以求得（ ）A.钢筋坠地瞬间的速度约为B.钢筋在整个下落时间内的平均速度约为C.钢筋坠下阅读理解 　　 Edison's Marriage (婚礼) 　　 　　After marriage Edison took his new wife to the new house he had bought at 97 Wright Street, in New York. As soon as they were in the house alone together for the first time, Edison began to think about a problem he was having with one of his inventions. He told Mary, his new wife, that he had to go to his office, but would soon return, Mary didn't want to anger him by asking him not to go. So, married only for one hour, the new husband ran to his business. 　　Mary spent her first day as a wife alone, fearful (害怕的) and tearful. Late the night Joseph Murray, one of Edison's friends and workers, came to the office. 　　“Why are you here, Tom?”Murray answered. “I must go home,”said Edison. 　　Only then did he realize (认识到) that he was married that day. 1．Which of the following is right? [　　] A．In the night of his marriage, Edison was still busy with his invention. B．Edison didn't like to live with his new wife. C．Edison liked to be alone. D．Edison was a person with bad manners (行为). 2．In this story, “run” means to ________. [　　] A．workB．jump up rapidly(快的) C．make a quick tripD．go in a hurry 3．Why did Edison go to his office? Because he ________. [　　] A．didn't love Mary B．put his heart into his invention C．wanted to see Murray D．quarreled (争吵) with his new wife 4．At that night, Edison's new wife ________. [　　] A．felt very angry B．felt very sad C．was very happy D．thought she shouldn't have got married to Edison 5．In this story the writer tells us that Edison ________. [　　] A．had made a new invention B．didn't love his new wife C．devoted (献身于) his life to the invention D．was a great scientist