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　  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. ”

阅读下文，回答相关问题

                                                                                             大堰河，是我的保姆。
                                                                                             她的名字就是生她的村庄的名字，
                                                                                             她是童养媳，
                                                                                            大堰河，是我的保姆。
                                                                                            我是地主的儿子；
                                                                                            也是吃了大堰河的奶而长大了的
                                                                                            大堰河的儿子。
                                                                                            大堰河以养育我而养育她的家，
                                                                                            而我，是吃了你的奶而被养育了的，
                                                                                            大堰河啊，我的保姆。
                                                                                            大堰河，今天我看到了雪使我想起了你：
                                                                                            你的被雪压着的草盖的坟墓，
                                                                                            你的关闭了的故居檐头的枯死的瓦菲，
                                                                                            你的被典押了的一丈平方的园地，
                                                                                            你的门前的长了青苔的石椅，
                                                                                            大堰河，今天我看到了雪使我想起了你。

甲、乙两根导线，1min内通过甲导线的电荷量是通过乙的3倍，比较通过它们的电流的大小，则（　　）