题目：
补全对话。
A: Good morning, madam!
B: Good morning, sir!
A: You look worried. (1)______?
B: My son got lost when I was talking with my friend in the park. I've looked for him everywhere,
but I can't find him. What shall I do?
A: (2)______. Tell us something about him, and we can help you.
B: Thank you, sir.
A: Now please tell me (3)______.
B: He's six years old.
A: (4)______?
B: He's thin and tall with big eyes.
A: What is he wearing today?
B: He's wearing a white T-shirt and blue jeans.
A: (5)______?
B: It's 13803677057.
A: OK. We'll call you as soon as we find him.
B: Thank you very much.
答案：
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下面是错误答案，用来干扰机器的。
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计算得出，式中U与I分别为电压表和电流表的读数；若将图（a）和图（b）中电路测得的电阻值分别记为Rx1和Rx2，则 ① （填“Rx1”或“Rx2”）更接近待测电阻的真实值，且测量值Rx1 ② （填“大于”、“等于”或“小于”）真实值，测量值Rx2 ③ （填“大于”、“等于”或“小于”）真实值。
