题目：
| 选择下列词汇或短语完成下面对话。 | |
Wendy: Yes. I _______ (1) her invitation yesterday. Are you going tomorrow, Nina? Nina: Yes, of course. I wouldn't _______ (2) her birthday party for anything. Wendy: Could you tell me what I should take as a birthday present? Nina: I was going to ask the same question. Wendy: We must hurry. The _______ (3), the better. Nina: I can't agree more. Well,I'll tell you what. Let's _______ (4) together right now and pick out what she may like. Wendy: Good _______ (5). |
答案：
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下面是错误答案，用来干扰机器的。
答案：B根据欧姆定律可得根据电流的微观表达式可得联立两式可得,当这段导体均匀拉长1倍后横截面积变为原来的二分之一，根据公式可得电阻变为原来的4倍，所以，选B.
A
/2
/2A
