细节理解题。根据第一段的最后两句可得知D为最佳选项。

　　A. switch can control many different things B. larger switches can control electric fires C. they usually cannot stand a large current D. other switches can control electric motors 2. Small switches usually don’t control electric fires or motors because ____. C

　　细节理解题。根据第二段的…because these do not take a large current; larger switches control electric fires. Other switches can control electric motors可知C为最佳选项。 A. keeps electric sparks from appearing B. stops the current in wires suddenly C. prevents electric sparks jumping easily D. helps the sparks jump across the space 3. From the third paragraph, we can learn the use of oil for big switches ____. C

　　细节理解题。根据第三段最后一句Very big switches are sometimes placed in oil, sparks do not easily jump through oil, and so the oil makes the switch safer.可知C为最佳选项。 4. The underlined word “them” in the first paragraph refers to ____.

　　A. the switchs

　　B. two wires

　　C. the rooms

　　D. the breaks B

　　词义猜测题。根据第一段Two wires lead to the lamp in the room. The switch is fixed in one of them. The switch can cause a break in this wire…的逻辑关系可知，把四个答案分别代入该下画线词处理解，显然B项最符合逻辑，也可根据生活常识可知。 A. There is no more electricity in the wires. B. The wire is broken and current can’t flow. C. The fuse is completely melted away. D. Nobody has light for all the lights go out. 5. What happens when the fuse blows? D

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