白矮星靠什么力支撑（）
A、爱丁堡不相容原理的斥力
B、泡利不相容原理的斥力
C、质子和质子之间的斥力
D、电子和电子之间的斥力
参考答案：B
补全对话。
A: Excuse me. What day 1_____ yesterday?
B: It was Sunday.
A: 2_____ you very busy?
B: Yes, I was very busy.
A: What 3_____ you do?
B: I did my homework first. Then I 4_____ to the park with my parents.
A: How did you go there?
B: By bus. We 5_____ a good time in the park.
A: Where did you have lunch?
B: In the park. We had milk and bread for lunch.
如图所示，为使灯泡最亮，开关应该连到 （A端或B端），如图所示，为使灯泡最亮，开关应该连到 （A端或B端）。
