I am sure you have a mobile phone. Now functions (功能) of the mobile phones have greatly expanded (扩张). Maybe your mobile phone can take photos________  Mine can get online or get on QQ. So the mobile phone not only can make telephone calls. You can do a lot of things with the mobile phones, Such as sending and receiving messages, listening to the music and playing games.
Now the 3G mobile phones become popular in our country        After January 2009, people can use their 3G mobile phones in many cities of our country. They can send and receive pictures while they are talking on the mobile phones. Look at the picture. It is a 3G mobile phone. You can take more good pictures with this kind. If you can't go home to watch TV, you can turn on your 3G mobile phone and watch CCTV news        You can also play games just like on computer on the Internet.
The important thing is that many companies said your phone fee won't go up although you can do all these things         It is reported that about two years later, all of the 3G mobile phones will be used in any part of our country.

A. His mobile phone can play MP3 or MP4. B. You can also watch movies on this kind of mobile phone. C. So many people hope they can use 3G mobile phones at once. D. Our government allows three companies to support 3G mobile phones.

This passage mainly tells us something about __

A．mobile phones	B．the fee of the mobile phones
C．3G mobile phones	D．the functions of the mobile phones