How to properly ask passengers to turn off mobile phone for take-off?

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How to properly ask passengers to turn off mobile phone for take-off?

A.Could you please switch off your cell phone?

B.Would you please turn off your mobile phone?

C.Smoking is not allowed.

D.Remote-controlled equipment is prohibited.

参考答案:

答案: Could you please switch off your cell phone?;Would you please turn off your mobile phone?