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It seems like everywhere a person goes there is at least one person with a cell phone to his ear. Even
in places  1  cell phone usage is banned such as concert halls or movie theatres there is the  2  offender, or at least a few people using the text messaging feature  3  their phones.
Cell phone usage has  4  over the past decade and continues to rise. Nearly 200  5  people in the
United States have cell phones and there are  6  over one billion users worldwide. That means there are
a lot of phones  7  their frequencies over the airwaves at any given time.
Concern has arisen over whether or not cell phone usage  8  harm a person's health. Brain cancer
rates in the United States have risen since call phones were  9  , leading some people to wonder if cell
phone usage is the reason for the  10  .
Some people say the biggest danger  11  cell phones isn't from the either real or perceived potential
to develop cancer, but from  12  while using the cell phone. How many of us have seen vehicles
driving  13  erratically (不稳定地) down the road. And we often see when we get near the vehicle the
driver on a cell phone is  14  on a cell phone. It is a proven fact that a driver on a cell phone is  15  
attentive and more likely to get in an accident. And, hands-free sets aren't the  16  that some people
may believe. Yes, they  17  both hands for driving and prevent a person from getting a sore (酸疼的)
arm,  18  the driver's mind is still  19  the conversation and therefore less attentive to what is  20  
around him or her on the road.
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