B

　　Since 1946, one of the most important inventions has been the computer. It has been changing all our lives.

　　The first computer ____1___ (build) in 1946. It ____2____ (be) as large as a room and very difficult and slow ____3____ (use). But since the invention of silicon “chip”(硅片)，computers ____4____ (become) smaller, easier and faster to operate. Some computers ____5____ (be) as small as TV sets. Some can even ____6___ (make) smaller than a book. And computers ____7____ (get) smaller and smaller all the time. Who knows what the computers of tomorrow ____8___ (be) like?

　　There ____9___ (be) several reasons why the computer is useful to us. First, a lot of information can ____10____ (put) into computer. Second, the computer works very quickly---thousands of times faster than a man and it will not be tired. Third, modern computers can be built into other kinds of machines, like radios, cars and planes. So today people can spend less time doing more work with a computer.

　　三. 用所给动词的适当形式填空

　　1. No matter what the weather is like, you can always find surfers out _______ (ride) the waves.

　　2. ---What do you use the key for?

　　---It is ________ (use) for making the robot work.

　　3. No news _______ (be) good news. I’m sure Jane is still all right.

　　4. ---Are you feeling better these days?

　　---Yes, much better. I _______ as well as these days for a long time.

　　5. It ________ (rain) heavily, you’d better not go out now.

　　6. The city of Xian _______ (become) cleaner and cleaner.

　　7. The boys enjoy _______ (see) fight films very much.

　　8. He left the room without _______ (say) goodbye.

　　9. Rice ________ (grow) in the south of China.

　　10. Many trees ________ (plant) in our school yard these years.

　　四. 用方框中所给的动词或动词词组的适当形式填入下列句子里，使其意思通顺，每个动词或动词词组只能用一次Allow, fall, not be, phone, receive, show, send for,

　　pay for, be used for, turn it off, keep on

　　1. It’s rather hot today, but the weather report says the temperature _______ to 28C tomorrow.

　　2. “Remember, nobody ________ to eat or drink in the computer room,” the assistant said to the new students.

　　3. Hi, Mike! I _________ your invitation. Thank you very much. I’ll come on time.

　　4. This time yesterday I ________ the foreigners around the ancient church.

　　5. My uncle phoned the booking office of the airline, and he was told there _______ any flights to Singapore in the following three days because of the bad weather.

　　6. Don’t lose heart and ________ trying.

　　7. Don’t watch TV. It’s too late. Please _______ and go to bed right now.

　　8. Computers are useful. They can ________ sending E-mail.

　　9. If you’ve lost this book, you have to _______ it.

　　10. Both of his feet were hurt in the accident. _______ a doctor, please.

　　【练习答案】

　　一.1.A 2.B 3.A 4.A 5.B 6.C 7.A 8.D 9.B 10.D 11.A 12.D 13.D 14.A 15.C 16.C 17.A 18.D 19.C 20.C

　　二. 1. was built 2.was 3. to use 4. have become 5. are 6. be made 7. are getting 8. will be 9. are 10. be put

　　三. 1.riding 2.used 3.is 4.have not felt 5.is raining 6. is becoming 7.seeing 8.sayig 9.is grown 10.have been planted

　　四. 1.will fall 2.is allowed 3.have received 4.was showing 5.would not be 6.keep on 7.turn it off 8.be used for 9.pay for 10.Send for

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