—                .    

—I like summer best.

—What are you going to do this weekend?

—I together with my classmates _______ going to climb Mount Qian.

（2015·山东济宁）2014 年 11 月 5 日至 11 日， APEC 会议在 举行。这次峰会的重大成果之一，是批准了由我国倡议的“ ”路线图。（）

根据短文内容，选择正确答案。
A
    One day, Mr. and Mrs. White went shopping by car. They stopped their car near a store. They bought a lot of things and they wanted to put them in their car. But Mr. White couldn't open the door of the car. “Let's ask a policeman for help.” said Mrs. White. They asked a policeman to help them. The policeman was very friendly to help them open the door of the car. Just then a man came up and shouted, “What are you doing with my car?” Mr. and Mrs. White took a look at the number of the car. It was not their car.

如图，三角形纸片ABC，AB=12cm，BC=7cm，AC=8cm，沿过点B的直线折叠这个三角形，使顶点C落在AB边上的点E处，折痕为BD，则△AED的周长为（   ）