题目内容
（请给出正确答案）
The communications explosion is on the scale of the rail, automobile or telephone revoluti
By then we'll be wrestling with another question: how we control all the electronic (6)_____ connected to the internet: trillions of PCs, laptops, cell phones and other gadgets. In Cambridge, we're already working (7)_____ millimetre-square computing and sensing devices that can be linked to the internet through the radio network. This sort of (8)_____ will expand dramatically (9)_____ microscopic communications devices become dirt-cheap and multiply. Just imagine (10)_____ the paint on the wall could do if it had this sort of communications dust in it: change colour, play music, show movies or even speak to you.
(11)_____ costs raise other possibilities too. (12)_____ launching space vehicles is about to become very much cheaper, the number of satellites is likely to go up exponentially. There's lots of (13)_____ up there so we could have millions of them. And if you have millions of loworbit satellites, you can establish a (14)_____ communications network that completely does away with towers and masts. If the satellites worked on the cellular principle so you got spatial reuse of frequencies, system (15)_____ would be amazing. Speech is so (16)_____ that I expect voice communication to become almost free eventually: you' 11 pay just a monthly fixed (17)_____ and be able to make as many calls as you want. By then people will also have fixed links with business (18)_____, friends and relatives. One day I (19)_____ being able to keep in touch with my family in Poland on a fibreoptic audio-video (20)_____; we'll be able to have a little ceremony at supper-time, open the curtains and sit down "together" to eat.
A．electrically
B．electronically
C．automatically
D．technically
答案
