用所给词的正确形式填空。

1. "Do you like noodles?" "No, I don’t like _____ at all."( they )

2. He often _____ letters to his mother. ( write )

3. Our _____ begin at 7:30 every morning. ( class )

4. We are twins. I have long hair, and she _____ long hair, too. ( have )

5. The _____ like milk and cakes. (baby)

关于磁感线，下列说法中正确的是[ ]

A．磁感线是磁场中实际存在的曲线

B．磁体周围的磁感线都是从磁体北极出来回到磁体的南极

C．小磁针的南极在某点所受磁场力的方向，跟该点磁感线的方向相同

D．磁感线只分布在磁体外，不分布在磁体内