题目内容
18．According to the air traffic rules，you should ____ your mobile phone before boarding．（ ）| A． | switch on | B． | switch off | C． | put on | D． | put off |
分析 根据空中交通管制规则，在登机前应该关闭手机．
解答 正确答案：B．A表示打开、启动，B表示关闭、切断，C是穿上、播放、增加等，D是拖延．根据题干可知根据空中交通管制规则，在登机前应该关闭手机，故选择B．
点评 本题考查动名词短语辨析，基础题，熟悉每个选项的含义，再根据题干进行选择．
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