如图是某事件的局部示意图，据此可以推断该事件是（　　）

读下图，完成1～2题(图中各数字代表该点的月份)

生活中我们常看到“白气”，下列有关“白气”形成的说法中正确的是（　　）

   Today is Saturday. It’s sunny and warm. Many children from No. 1 Middle School are at the Old People’s Home. Now, they’re helping the old people.
   Look! Li Min and Zhan Ran are cleaning the windows. Ma Lan and Liu Qian are washing clothes.
   What’s Li Na doing over there? Many old people are clapping their hands(鼓掌)for her. Oh,  she’s singing for them. Her song is really beautiful. And where’s the American boy, Tom? He likes helping others and he often comes here. Listen! Who’s speaking English? It’s Tom. He’s teaching two old people to speak English.
   All the children and the old people are very happy. “We are happy when we help others, ” says Tom.