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  3. The communications explosion is on the scale of the rail, automobile or telephone revolution. Very soon you’ll be able to record

The communications explosion is on the scale of the rail, automobile or telephone revolution. Very soon you’ll be able to record

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问题     The communications explosion is on the scale of the rail, automobile or telephone revolution. Very soon you’ll be able to record your entire life electronically—anything a microphone or a camera can sense you’ll be able to store. In particular, the number of images a person captures in a lifetime is sure to rise dramatically. The thousand images a year I take of my children on a digital camera are all precious to me. In a generation’s time, my children’s children will have total image documentation of their entire lives—a visual diary of tremendous personal value.
    In Cambridge, we’re already working on millimeter-square(平方毫米) computing and sensing devices that can be linked to the Internet through the radio network. This sort of connectivity will expand dramatically as tiny communications devices become dirt-cheap and multiply. Just imagine what the paint on the wall could do if it had this sort of communications dust in it: change color, play music, show movies or even speak to you.
    Falling costs raise other possibilities too. Because launching space vehicles is about to become very much cheaper, the number of satellites is likely to go up greatly. There’s lots of space up there so we could have millions of them. And if you have millions of low-orbit satellites you can establish a global communications network that completely does away with towers and poles.
    Speech is so flexible that I expect voice communication to become almost free eventually: you’ll pay just a monthly fixed charge and be able to make as many calls as you want. By then people will also have fixed links with business contacts, friends and relatives. One day I anticipate being able to keep in touch with my family in Poland on an optical-fiber audio-video link; we’ll be able to sit down "together" to eat.
    Cars are an interesting IT-platform because they have big batteries and lots of so far unconnected digital devices. Soon each one will be on the Internet so your children can play games while you’re traveling and your partner can deal with their email. And every lamppost could be on the Internet too—each one with sensors to monitor light, pollution, air quality and traffic flow.
Which of the following statements about the low-orbit satellites is true?
选项 A、The low-orbit satellites can help reduce the costs of communications network.
B、The low-orbit satellites will enable all the communications networks to combine.
C、The low-orbit satellites would replace towers and poles functionally.
D、There will be more low-orbit satellites than other kinds of satellites.
答案C
解析 推理判断题。本题考查复合句及do away with的理解。第3段最后一句的定语从句表明通讯网络以后可以不依靠发射塔或电线杆了，换句话说，低轨道卫星在功能上可以代替发射塔或电线杆，因此C是正确选项。选项A是最具干扰性的，因为“成本降低”这个说法在本段一开头就提到，但是文中事实上并未提到使用低轨道卫星能降低通讯网络的成本，相反，正因为成本降低了，才使得使用低轨道卫星成为可能，因此选项A颠倒了因果关系。
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