9．
CELL phones help us easily find people anywhere at any time．A cell phone can include many things，such as games，music and Internet access．Today，4.6billion people around the world have cell phones，according to CBS News．
However，cell phones may cause cancer（癌症），according to the World Health Organization．In a 2010study，people who used a cell phone for 10years or more were more than two times as likely to get cancer，according to CNN．
The following suggestions may help you reduce your risk of cancer：
1．Use a headset（头带式耳机）or speaker
Headsets give out much less radiation（辐射）than phones．Some wireless（无线的）headsets give out low-level radiation．However，you should take it off your ear when you're not talking to anyone．Using your phone with a speaker will also make it safer．
2．Listen more，talk less
Your phone gives out radiation when you talk or text，but not when you're listening or getting messages．Listening more and talking less can lower the risk of cancer．
3．Hold the phone away from your body
Hold the phone away from your body when you're talking，not against your ear．Also，don't keep it in your pocket．
4．Choose texting over talking
Phones emit（发出）less radiation to send texts than to carry a person's voice．Texting also keeps radiation away from your head．
5．Poor signal？Stay off the phone
Fewer signal bars on your phone mean that the phone needs to give out more radiation to work．Make and take calls when your phone has a strong signal．
31．According to CBS News，C people all over the world have got cell phones．
A.460thousand
B.4.6million
C.4.6billion
D.46billion
32．From Paragraph 1，we know thatD．
A．cell phones have three new ways
B．people can do nothing without cell phones
C．it's dangerous to use cell phones too much
D．cell phones help us a lot and many people use them
33．The study from 2010showed thatC．
A．people should use cell phones for no more than 10years
B．people who don't use cell phones will not get cancer
C．the longer people use cell phones，the more likely they are to get cancer
D．the more cell phones people have，the more likely they are to get brain cancer （脑癌）
34．How many suggestions to reduce cancer are mentioned in this passage？A
A．Five．
B．Four．
C．Three．
D．Six．
35．The passage mainly talks aboutD．
A．the development and advantages of cell phones
B．the reason why cell phone radiation causes cancer
C．the best ways to use cell phones to communicate
D．how to protect ourselves from cell phone radiation．
