30: — I'd like to book a room, please. — _______ A: Single or double? B: Good or bad? C: Which room? D: We don't have books here. ...

13: — I didn't know my identity card（身份证）was needed, sir. — ______ A: That's sorry. B: I don't believe you. C: Sorry, but that's no excuse. D: You can't say that. ...

25: — Will he have to be hospitalized? — _______ A: No, he will recover soon. B: It will last long. C: There is nothing wrong with me. D: He has a serious headache. ...

10: — Are you feeling better today, Jack? — _______ A: There must be something wrong. B: Just have a good rest. C: Yes, thank you, doctor. But I still don't feel good. D: Don't worry about me. ...

22: — You’d better have more physical exercise. — _______ A: I’d like that, but I can’t afford the time. B: That’s good. C: Really. D: Yes, I would. ...

21: — Hi! How do you do, Zhang? — _______ A: How are you？ B: Good afternoon. C: How do you do? D: Very fine. ...

3. 一运动电荷q，质量为m，以初速率v进入均匀磁场中，若v与磁场的夹角为α，则 A. 其动能改变，动量不变 B. 其动能和动量都改变 C. 其动能不变，动量改变 D. 其动能、动量都不变 ...

16. 下列哪一种说法是正确的 A. 变化着的电场所产生的磁场，一定随时间而变化 B. 变化着的磁场所产生的电场，一定随时间而变化 C. 有电流就有磁场，没有电流就一定没有磁场 D. 变化着的电场所产生的磁场，不一定随时间而变化 ...

20. 处于静电平衡中的导体中任意两点之间的电势差为零 A. 错误 B. 正确 ...

10. 电量相等的四个点电荷两正两负分别置于边长为a正方形的四个角上，两正电荷位于正方形的对角上。以无穷远处为电势零点，正方形中心O处的电势和场强大小均为零 A. 错误 B. 正确 ...