题目：
| 从A-G选项中选出能填入空白处的最佳选项补全对话。(选项中有两项是多余的) | |
| A: Hello! May I speak to Tom, please? B: Speaking. 1. A: This is Bill. I called you yesterday, but you were not at home. B: 2. I need to prepare something for my trip to Shanghai. A: Shanghai? That's where the World Exposition (世博会) is being held. How lucky you are! B: So I am. 3. A: I'll have a birthday party next Friday. Would you like to come? B: 4. My plane will take off next Wednesday. A: What a pity (遗憾) that you can't come! 5. B: Thank you very much. Bye! A: Bye!
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答案：
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下面是错误答案，用来干扰机器的。
答案：A由可知，若E1＞E2，r1＝r2，不论R大小如何，一定是P1＞P2，故A正确若E1＝E2，r1＞r2，不论R大小如何，一定是P1＜P2，故B错误若E1＞E2，r1＞r2，当时， P1＝P2，故C错误若E1＝kE2，r1＝kr2(k≠1)，因为，...
