题目

下图所示是城市路口安装的监控摄像头，它可以拍摄照片，记录下违章行驶或发生交通事故的现场．摄像头的镜头相当于一个 ________透镜，它的工作原理与 ________（选填“照相机”、“投影仪”或“放大镜”）相似． 答案：【答案】凸 照相机 【解析】摄像机的镜头相当于一个凸透镜,当物体位于其二倍焦距以外时,物体在凸透镜中成倒立缩小的实像.因此其成像情况与照相机相似.　　A man was tired of living in his old house in the country and wanted to sell it and buy a better one. He attempted(试图) to sell it for a long time, but was not successful, so at last he decided to solve the problem by using an estate(房地产) agent(代理) . 　　The agent promptly(迅速地) advertised the house, and a few days later, the owner saw a very attractive photograph of it, with a wonderful description(说明) of its gardens, in an expensive magazine. 　　After the house owner had read the advertisement through, he hastened to telephone the estate agent and said to him, “I' m sorry, Mr. Jones, but I've decided not to sell my house after all. After reading your advertisement in that magazine, I can see that it's just the kind of house I've wanted to live in all my life. ” 1．Why did the man want to sell his house? 2．Why did he finally have to go to an estate agent? 3．What did the estate agent do about selling the house? 4．How did he lose a sale by being too good at his job?