A mobile phone（手机）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（信号）. 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（功率高的）to send their signal to faraway places. This was because most cities had only one antenna tower（中继站）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.

　　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?

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A．three

B．five

C．seven

D．nine

[　　]

A．They are small but very powerful.

B．They are very popular and cheap.

C．They are very easy for us to use.

D．They arc big enough to send a signal.

(3) What does the writer write the article（文章）for?

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A．To give us some common knowledge of the mobile phone.

B．To introduce how the mobile phone works and what use it has.

C．To tell us what short forms of words mean in written messages.

D．To show us in what way the mobile phone is expected to develop.

Saturday morning was bright and fresh. There was a song in every heart, cheer on every face, and a  spring in every step.
Tom appeared with a bucket of white paint in one hand and a brush in the other. His Aunt Polly told him to paint the fence around the garden. It was thirty yards long and nine feet high. He felt very depressed.
Then he had a wonderful idea. He picked up his brush and started to work.
Soon Ben came along the road. He was happily eating an apple. He stopped to look at Tom. Tom went on painting and pretended（假装）not to see Ben.
“I’m going swimming,” said Ben. “Do you want to go swimming, Tom? But I guess you can’t. You have to stay and work, don’t you?”
“Work?” Tom said. “This isn’t work. I’m enjoying myself. Does a boy get a chance to paint a fence like this every day?”
Ben  thought  about  this.  Tom  continued  painting  carefully. Sometimes he stopped, stood back to look at the fence like an artist, and then added a bit more paint in just the right place. Ben was watching Tom paint with great interest. He was getting more and more eager to have a try himself.
After a while, Ben asked Tom if he would let him paint a little. Tom thought about it, and said,
“No, Ben, I can’t. You see. Aunt Polly wants it to be done well. Aunt Polly said that I must paint it with great care.”
“Oh, please, Tom,” begged Ben. “I can do it. I’ll be really careful. Just let me try. I’ll give you half of my apple. Well, I’ll give you all of it!”
“Well, all right, Ben,” said Tom. “You must be very careful.”
He gave Ben his brush with worry on his face but joy in his heart. He sat down under the tree, and started to eat Ben’s apple. All day, boys came to make fun of Tom, but they ended up staying to paint. When Ben got tired, Billy was waiting. He gave Tom a kite for a chance to paint. Then Johnny offered him twelve marbles, and so on.
By late afternoon Tom had gained all sorts of toys, and the fence had gained three  coats of paint. Later Aunt Polly came to look at the painted fence. She was so pleased with Tom’s work that she gave Tom a large cake!
【小题1】Why did Tom pretend not to see Ben when he came and watched him painting?