题目：
补全对话，首字母已给出。
A: Hi, Jenny! Can you come to my birthday party on Saturday afternoon?
B: I'm s 1 I can't. I h 2 to help my parents.
A: That's too bad. How a 3 you, Linda?
C 4 you come to my party?
C: I'd l 5 to.
A: Susan? Can you come to my party?
D: W 6 is it?A: Saturday afternoon.
D: Oh, no, I c 7 . I have to study f 8 a test.
A: What about you, Ted?
E: I'd love to, but I have to go to the doctor w 9 my grandmother. She is ill.
A: What a pity! Maybe a 10 time.
E: Sure. Thanks for asking.
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：同一根熔丝上的不同粗细部位相当于串联在一起，不论粗细，流过它们的电流相等，但根据可知，越细（横截面积小）的地方的电阻就越大，则越细（横截面积小）的地方消耗功率越大，越容易烧断。
