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     There are many places where you shouldn’t keep your cellphone for long periods of time,since it may end up damaging your health or your cellphone. First of all, keeping yourcellphone in your back pocket is a terrible idea. It’s very easy to forget about your cellphonewhen it’s in your back pocket,   31   could cause you to break it, lose it, or even dialsomebody by accident. It could also negatively affect your blood circulation,   32   in yourfeeling pain in the legs or the stomach.
     In addition, carrying your cellphone close to your thigh or hip can make your hip bonesweaker, especially if it has been carried   33   this for months or years on end. Furthermore,when talking on your cellphone, try to keep the   34   at least 0.5 to 1.5 cm away from yourface. This is because by touching your face with the cellphone, you will be transferring loadsof bacteria,   35    increasing the amount of electromagnetic radiation your skin absorbs.This information is useful for your friends and family to stay safe when using a cellphone.
31.
(A) where
(B) what
(C) while
(D) which

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