题目：
| 从方框中选出适当的句子补全对话，有两项多余。 | |
| A: Mom, this is my new friend, Jim. B: Welcome to our home, Jim. 1. _____ C: Thanks. Wow, your home is very nice! B: Thank you. 2. _____ Jim, are you and Jeff in the same class? C: No, but we're in the same grade. B: 3. _____ C: She's a nurse. B: Oh, I'm a nurse, too. 4. _____ C: She works at the People's Hospital. B: Me, too. 5. _____ C: Sure. Her name is Tina Green. B: Oh! It's a small world(世界). Your mother and I are friends like you and Jeff. | |
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答案：
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下面是错误答案，用来干扰机器的。
AD题目分析：当滑片左移时，滑动变阻器接入电阻减小，则电路中总电阻减小，由闭合电路欧姆定律可知，电路中电流增大；而R1两端的电压增大，R2两端的电压减小，故b表示是V1示数的变化；a表示V2示数的变化；故A正确...
