According to the air traffic rules，you should your mobile phone before bo
题型：不详难度：来源：
According to the air traffic rules，you should your mobile phone before boarding．| A．switch over | B．switch on | C．switch off | D．switch round |
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答案
| C |
解析
| 本题考查短语辨析。switch off关闭；switch over转变；switch on打开；switch round改变。句意：根据空中交通规则，你应当在降落之前把你的移动电话关闭。 |
举一反三
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