判断两根钢条甲和乙是否有磁性时，可将它们分别靠近一枚小磁针。当钢条甲靠近时，小磁针自动远离；当钢条乙靠近时，小磁针自动接近，由此可知（   ）

补全对话 从每题A、B、C、D中, 选出一个能够填入对话空白处的最佳选项。
A: Hey, John.
B: Hi, Michael.
A:1
B: I’m reading a book.
A: 2I have got the latest movie video. Let's watch it together.
B: Great. Where is your house?
A:3. There is a small bookstore at the crossing. I'll meet you there.
B: Oh, OK.4
A: What about 2 pm?
B: OK. By the way, I haven't finished my homework yet and I have some problems with it.
A: 5We can do it together then.

某校学生小强从学校盗走财物，被发现举报后。公安人员到小强居住地调查时，不开警车，不着警服，不扩大知情面。这体现了 （）