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, 4.6 billion people around the world have cell phones, according to CBS news.
However, cell phones may cause cancer, according to the World Health Organization. In a 2010 study, people who used a cell phone for 10 years or more were more than two times as likely to get brain cancer, according to CNN.
These suggestions may help you reduce your risk of cancer:
1.Use a headset or speaker
Headsets give out much less radiation than phones. Some wireless 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 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.
From the first paragraph, we know that ____________.

A．people can do nothing without mobile phone

B．cell phones have three new functions

C．it’s dangerous to use cell phones too much

D．cell phones help us a lot and many people use them

The study from 2010 showed that _____________

A．people should use cell phones for no more than 10 years.

B．people who don’t use cell phones will not get brain cancer

C．the longer people use cell phones, the more likely they are to get brain cancer

D．the more cell phones people have, the more likely they are to get brain cancer

Which is NOT true about the suggestions mentioned in the passage?

A．Wireless headsets don’t give out radiation.

B．It’s not good to carry cell phones in pockets.

C．Texting is better than making phone calls.

D．Don’t make calls when the signal is weak.

The underlined word “emit” means________ in Chinese.

A．吸收

B．发出

C．包含

D．爆炸

This passage mainly talks about____________.

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