题目

阅读理解    The Blacks are American tourists. They are visiting Beijing now. This is their first visit to China. They are going to stay in China for three months. They want to visit some big cities and villages .They hope to learn some Chinese ,too.   Mr. Black is a taxi driver. He likes to drive in Beijing .Mrs Black is a school teacher. She is visiting a city school today and she’s going to visit a village school tomorrow. Their daughter is a middle school student. She is going to meet some Chinese students.   They are taking a lot of pictures in China. When they go back to Am太阳光经过三棱镜后，被分解成各种色光，这是光的色散色散现象．有三种色光适当混合能产生其它色光，这三种色光分别是红光、绿光绿光和蓝光．“黑板反光”是由于光射到黑板上发生镜面反射镜面反射而造成的，而全班同学都能看到讲台上的物体是由于光在物体表面发生漫反射漫反射的缘故．