Mike gets up at 6:00 every day. He brushes his teeth and takes a shower. He has breakfast at 6:30. Then he runs. At 7:10, he goes to school. He takes the Number 10 bus (公共汽车) to school with his sister. He gets there at 7:40. He doesn’t like to be late. Class begins (开始) at 8:00. He has four classes in the morning.

     Mike has lunch at about 12:00 at school. He likes the food very much. He has two classes in the afternoon. The classes finish at 4:00. Then he plays games with his friends.

    He gets home at 5:00. After dinner, he does his homework at 7:00 in the evening. Then he plays the guitar. He plays it very well. At about 9:00, he goes to bed. He is happy every day.

读某地地质剖面图，如下图，岩石产生的先后顺序是（      ）

求证：AB=CD．