题目

Our class is studying how things have changed over time. For my task, I spoke with my great-grandmother to find out what her school was like when she was my age. Here is what she told me. My school was called Algoe School. It was a pretty, one-story building located at the bottom of two hills between some oak trees. The school was built in 1875 and was what is known today as a one-room school. There was only one teacher, but the students might be from different grades. Algoe School sometimes had as many as 18 students, but once there were only two. Every morning, the teacher would ring t现在的多媒体教室大都安装了表面粗糙的高清玻纤白幕布，这样可以利用光的  ▲ 使教室里各座位上的同学都能看到画面，而且这种白幕布能反射  ▲ 的光，使同学们能看到色彩正常的画面。