教室里有7人。下课了，老师走出教室，教室里有几个小朋友？

如图，某同学在课桌上随意将一块三角板的直角叠放在直尺上，则∠1+∠2的度数是（　　）

   Do you know the Chinese saying “He who doesn't reach the Great Wall is not a true man”? Mr. White knows it. Next month he is going to Beijing with his wife. They are going to visit the Great Wall. They are staying in Beijing for about a week. They have a lot of Chinese friends there, so they are visiting them. Then they're flying to West Lake in Hangzhou. They are going boating there and staying there for about three days. Mr. White knows that the Yellow Mountain is very famous in China. So they’re going to Anhui to go hiking in the great mountain. After two days in Anhui they'll have to go back to Sydney.
   “I'm taking lots of photos in China. When I get back to Sydney, I am going to show the photos to my friends. I want my friends to know more about China.” said Mr. White.