Question

Ever since man began to use telephone, there have been new problems arising from the carrying of messages. At first, each message was carried by a pair of overhead wires. As a result, telephone exchanges were soon surrounded by thousands of wires. The wires were then replaced by cables, each containing many pairs of wires. Each cable which was laid underground replaced wires.

The more extensive telephone services have become, the more demand for these services has increased, particularly the demand for long-distance services. In China, for example, this growth is now over 30% every year. Long-distance telephone exchanges are usually in crowded cities, where it is not easy to lay new cables for expanding services.

The use of radio to send telephone message and to link all telephone exchanges makes it possible to get rid of overhead wires and some underground cables.

Now man has invented the microwave system. In a microwave system messages from various places can be brought together, and then they are sent out and received by radio. After that the messages are split into their original form. Finally, they are sent to the places where they are going to be sent.

1. Overhead wires have now been got rid of in big cities because_______.

A. people use the telephone more at present than before

B. overhead wires need many poles for supporting

C. overhead wires haven’t satisfied the demand for telephone services in cities

D. the larger the population in cities has grown, the more widely the telephone has been used

2. In the article the author discusses mainly_______.

A. telephone is widely used in modern life of people

B. people communicate messages with each other

C. people have changed cable for an overhead wire

D. the way communication has developed rapidly at present

3. A cable is different from an overhead wire because it________.

A. carries more messages

B. is much longer

C. needs more exchanges

D. is made of steel

4. As mentioned in the article, why has the microwave system been used in communication? Because it______.

A. is used widely and simply

B. may send messages by radio

C. carries messages through electricity

D. can send messages quickly to places where you want to do by it

 

Answer 1

答案：C;D;A;D
解析：

1、由文中可知，淘汰“overhead wires”是因为人们使用无线电来传递信息，也就是说“overhead wires”已经不能适应城市的需要了。 2、综观全文可知，本文主要谈了信息交流方式的快速发展。 3、由文中可知每一条电缆中都包含：many pairs of wires，因此输送的信息也就更多了。 4、由文章最后一段可知D为最佳答案。

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