一般来说，城市聚落比乡村聚落（   ）

步骤一：检验装置气密性后向B、C中各加入20mL图示液体。

步骤二 :打开A中活塞，反应进行10分钟后关闭活塞。

步骤三:用pH计分别测量B、C 试管中溶液的pH。

结合上述实验，回答以下问题:

    It is early in the morning, about seven o'clock. Peter is on the bus. He's going to school. There are many people on the bus and it is a bit hot. Peter is sitting by a window with a book in his hands. The bus driver is driving slowly(慢地). Most people on the bus are using their mobile phones. A girl in a red sweater is standing near Peter. She looks very happy. She is reading some funny things on her mobile phone. A fat boy behind him is busy playing games on his mobile phone. A tall man is Jack. He is listening to music on the mobile phone. He's about thirty years old. They are all busy and happy.