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  3. In the last fifty years communications throughout the world have been improved greatly. This is because of the telephone, radio

In the last fifty years communications throughout the world have been improved greatly. This is because of the telephone, radio

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问题     In the last fifty years communications throughout the world have been improved greatly. This is because of the telephone, radio and television. Recently the use of satellites has increased the speed of communications as well as the distance over which people can communicate. Television pictures can now be sent from one side of the world to the other by means of satellites.
    In the world of tomorrow the television will still play an important part. One important development will be a new dialing system. We will be able to pick up our telephone and make a phone call anywhere in the world. Another important development is the "videophone" This telephone will have a small screen on which the speakers will be able to see each other.
    The laser beam will also be very helpful to future communications. It has been shown that over seventy television programs can be shown at the same time by means of a single laser beam. The laser beam will also help in the sending of television and telephone messages by satellites.
    Computers are also important in communications at present and will become even more important in the future. For example, one large company has over 2, 000 offices, all of which are connected to a single computer. If one of the branch offices wants some information, it sends a demand to the computer center. Here the demand is changed into computer language. Computer language may be different for different kinds of computers. One kind of computer language is in the form of small cards with the patterns of small holes in them. The computer reads the patterns in the cards and then produces the information. This is sent back to the computer center where it is hanged back into ordinary language. Then it is sent on to the office that wanted it.
    Scientists have been developing a new form of TV-confravision. In the future when businessmen want to hold a meeting with other businessmen they will use "confravision". In a special meeting room they will be connected by television to other businessmen who may be in another country. They will carry on their meeting as though they were all in the room together.
    In tomorrow’s world the speed of communications and amount of material sent and received will be greatly increased. Telephoning a friend on the other side of the world will be like telephoning a friend in the same city; and computers and television meetings will be part of everyday business life.
______communications throughout the world have been improved greatly in the last fifty years
选项 A、Because of the satellites
B、Because of the laser beam
C、Because of the telephone, radio and television
D、Because of the computers
答案C
解析
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