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某山区氟牙症流行，调查饮水氟浓度不高，最可能的原因是
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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 (1) —anything a microphone or a camera can sense you’ Il be able to (2) . In particular, the number of images a person captures in a lifetime is set to rise exponentially. The thousand (3) a year I take of my children on a digital camera are all precious to me. (4) a generation’ s time, my children’ s children will have total image documentation of their entire lives—a (5) log of tremendous personal value.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. Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.18（）
患者上前牙龋充填后3天出现白发痛，不敢咬合。查：左上一远中充填体，叩(++)，松动Ⅰ度，牙龈轻微红肿，冷热测无反应，该牙3天前处理中的问题最可能是( )
票据出票日期使用小写填写的，开户银行可以受理，但由此造成的损失由出票人自行承担。（）
老年无牙颌患者，义齿戴用7年，自觉咀嚼不利，面显苍老。其原因是
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