Which one is a polite rule for cell phone use?

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Which one is a polite rule for cell phone use?

A.Talk on your cell phone in a restaurant.

B.Download annoying or overly loud ring tones.

C.Answer cell phone calls when you are with others.

D.Do not wear earpieces when you are not talking on the phone.

参考答案:

答案:Do not wear earpieces when you are not talking on the phone.