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a. work (机器)运转&vt.操作=operate vi.&vt.
例:The air conditioner doesn't work/operate now. Should we call someone to fix it?
(空调现在不动了。我们是不是该找个人来修?)
Dad doesn't know how to work/operate the washing machine.
(爸爸不会用洗衣机。)
b. turn off sth Iturn sth off关掉某物的电源
=switch off sth / switch sth off
turn on sth / turn sth on打开某物的电源
=switch on sth / switch sth on
例:Remember to turn off the lights when you leave the room.
(离开房间时要记得关灯。)
Linda always switches the TV on once she gets home.
(琳达总是一回家就开电视。)
答案：
B
n. 开关，转换，鞭子
v. 转换，改变，交换
