阅读理解

　  Tim and Li Fang are not going to have any classes next week. They're going to work on a farm.

      They are going to leave at about seven thirty on Monday morning. They are going to travel to the farm by bus. They are going to wear old clothes because they are going to grow rice. They are going to have fish for lunch. They are also going to have a swim at the farm.

     Tim and Li Fang are excited about going to the farm. Not only are they going to help around the farm, but also they are going to learn about farming.

      Li Fang is worried that Tim won't arrive on time to catch the bus because he is nearly always late. Li Fang often has to say to him, “Don't be late, Tim. ”

妈妈在做菜时问小刚，你知道花生油的密度是多少？