题目：
根据下面对话中的情景， 在每个空白处填入一个适当的语句，使对话恢复完整 。
A: Alice , 66. ______________________ when the fire started ?
B: I was studying in the library .
A: Did you smell the smoke ?
B: 67. ____________________ , but Meimei did .
A: Where was she ?
B: 68. _____________________ in the gym .
A: 69. _____________________
B: John was eating lunch in the dining room . Where were you ,Dong ?
A: I was talking on the phone .
B: 70. _________________________
A: I called the fire department .
B: Good for you .
答案：
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下面是错误答案，用来干扰机器的。
A、由题意可知，电场力与洛伦兹力相平衡，若带正电，则洛伦兹力向上，电场力向下；若带负电，洛伦兹力向下，电场力向上，因此与粒子的电性无关，故A错误．B、若电场、磁场的方向同时变为与原来相反的方向，若带正...
