Mobile phones help us easily find people anywhere at any time. A mobile phone can include many things, such as games, music and Internet surfing. Today, 4,600,000,000 people around the world have mobile phones, according to CBS News.
However, using mobile phones too often may cause cancer(癌症). It’s reported that people who used a mobile phone for 10 years or more were more likely to get cancer. The advice below may help you reduce the risk of cancer:
★An earphone gives out much less radiation(辐射) than phones. However, you should take it off your ear when you’re not talking to anyone.
★Your phone gives out radiation when you talk or text(发短信), but not when you’re listening or getting messages. Listening more and talking less can lower the risk of cancer.
★Hold the phone away from your body when you’re talking, not against your ear. Also, don’t keep it in your pocket.
★Phones gives out less radiation to send texts than to carry a person’s voice. Texting also keeps radiation away from your head.
★Do not use your mobile phone when the signal(信号) is weak. 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.
【小题1】According to CBS News, _____ people all over the world have got mobile phones.

A．4.6 million	B．4.6 billion
C．46 billion	D．460 thousand

【小题2】From Paragraph 1, we know that _____.

A．mobile phones have three new ways

B．it’s dangerous to use mobile phones too much

C．mobile phones help us a lot and many people use them

D．people can do nothing without mobile phones

【小题3】How many pieces of advice to reduce cancer are mentioned in this passage?

A．Six.	B．Five.
C．Four.	D．Three.

【小题4】The passage mainly talks about _____.

A．the development and advantages of mobile phones

B．the reason why mobile phone radiation causes cancer

C．how to protect ourselves from mobile phone radiation

D．the best ways to use mobile phones to communicate

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（癌症）, 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 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.

47. According to CBS News, _____ people all over the world have got cell phones.

A. 460 thousand      B. 4.6million              C. 4.6 billion              D. 46 billion

48. From Paragraph 1, we know that _____.

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

49. How many suggestions to reduce cancer are mentioned in this passage?

A. Five.             B. Four.                   C. Three.               D. Six.

50. The 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