A mobile phone is in fact a small radio. A radio sends a person's voice over a long way to another radio.
A voice that is sent by radio is called a signal. A radio signal travels very quickly.
     Only a few years ago, mobile phones were very large. They needed large batteries (电池). They had to
be powerful to send their signal to faraway places. This was because most cities had only one antenna tower
for mobile phones.
     Today's mobile phones are small and easy to use. Now most cities have a lot of antenna towers, not just
one. This means that each mobile phone doesn't have to send its signal far away, so they don't need to be so
powerful. Mobile phones today use small batteries. A large city, where lots of mobile phones are used, can
have hundreds of towers.
     Do you know what use a mobile phone has? Yes, you can use it to do a lot of things.
     Call your friends and family from almost anywhere.
     Call the police immediately if there is an accident in the street.
     Send or receive messages.
     Sending short written messages is a popular way to use your mobile phone. Many people use short forms
of words, so the messages are quick to write and read. Can you guess what these messages mean? Try reading
them out. What do you hear?
     RUOK? CUL8r!
     That's EZ!
     Will I C U B4 2moro?
     That's Gr8!

1. The writer talks about ______ uses of a mobile phone. 

A. more than three
B. less than three
C. seven

2. Why did the mobile phones need large powerful batteries some years ago?

A. Because the mobile phones had to send their signal to faraway places.
B. Because the mobile phones were too large.
C. Because the mobile phones could be used for a long time.

3. What does the writer think of today's mobile phones?

A. They are small but very powerful.
B. they are very popular and cheap.
C. They are very easy for us to use.

4. What does "Will I C U B4 2moro?" probably mean?

A. Will I see you before two past four in the morning?
B. Will I see you by 4:02 in the morning?
C. Will I see you before tomorrow?

5. What does the writer write the article (文章) for?

A. To introduce how the mobile phone works and what use it has.
B. To give us some common knowledge of the mobile phone.
C. To tell us what short forms of words mean in written messages.