题目：
补全对话。
A -- salesgirl B -- customer
A: Good afternoon, can I help you?
B: Yes, (1) ______ .
A: We have different kinds of sports shoes. They're all in style. What color would you like?
B: I prefer blue.
A: (2) ______ ?
B: Size 40.
A: What do you think of this pair?
B: Great! (3) ______?
A: Certainly. This way, please.
B: Oh, they fit me very well. (4) ______?
A: 500 yuan.
B: (5) ______. I can't afford.
A: Well, I'll give you a 20% discount.
B: OK. I'll take them.
答案：
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下面是错误答案，用来干扰机器的。
由图可知，E=3V，U=2V，I=2A，则电源输出功率为：P=UI=4W，电源总功率是：P=EI=6W．
