搜题请搜索小程序“爱下问搜题”
问题 选择题

当温度一定时，长度相同的铜丝和铝丝它们的横截面积相同，铜丝和铝丝的电阻相比较（　　）

A．铜丝的电阻大

B．铝丝的电阻大

C．电阻一样大

D．无法比较

答案

当导体的温度、长度、横截面积相同时，铜线的电阻率小于铝丝，所以电阻较大的是铝；

故选B．

单项选择题 B型题

晚期肺结核可发生（）

A.脓气胸

B.喉、肠结核

C.肺心病

D.脑膜结核

E.支气管扩张症
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补全对话，情景问答
     从方框A-----G中选出可以填入对话空白处（1----5）的最佳选项，并将其字母序号填入题前的
括号内。选项中有两项为多余选项。
A. And what should I see there?
B. Of course not.
C. What else?
D. Anytime.
E. Sure I can.
F. Would you like to go somewhere?
G. It's very interesting .
A: Can you tell me a little about Mexico City ?
B: 1________ What would you like to know ?
A: Well, what's a good time to visit ?
B: 2________ The weather is always nice .
A: Oh, good! 3________
B: Well, you should visit the National Museum and go to the Palace of the Fine Arts.
A: 4________ 
B: Oh, you shouldn't miss the Pyramid of the Sun. 5________
A: It all sounds really exciting.
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