Question

A. take off B. mean C. how D. against E. safely

Although we still don't know whether using mobile phones can cause cancer,we should try to use our phones__1.__.Here are some tips:

*Use a headset（耳机） or speaker.

Headsets give out much less radiation than phones.Some wireless headsets give out low-level radiation.However,

you should __2.__your headset when you're not talking to anyone.Using a phone with a speaker will also make it safer.

*Listen more, talk less.Your phone gives out radiation when you talk or text,but not when you're listening or getting messages.

*Hold the phone away from your body when you are talking,not _3._your ear.Also,don't keep it in your pocket.

*Choosing texting over talking.Phones give out less radiation when sending texts than when making calls.Texting also keeps radiation away from your head.

* Poor signal?Stay off the phone.Fewer signal bars（信号数） on your phone__4.__that the phone needs to give out more radiation to work.Make and take calls [when your phone has a strong signal.

Answer 1