某市口腔医院的一项统计结果显示，65岁至74岁老年人中，10人中就有一个全口无牙，调查结果表明，受教育程度越高的老人，全口无牙的比例越低，这说明这些老人对口腔保健比较重视，而大部分人受旧观念的影响认为人老了就应该掉牙，因此忽视了中老年人的口腔保健，使简单易治，痛苦小，治疗费用较低的龋齿，牙龈炎发展成治疗复杂，令人痛苦，治疗费用较高的牙髓病和牙周炎，如果这段文字所表述的内容是真实的，则以下哪一项也一定是真实的？
A．某些观念、卫生习惯的改变，会影响一个年老后患牙齿疾病的风险
B．如果一个人受教育的程度比较低，年老后患牙齿疾病的风险就比较大
C．定期检查，发现疾病及时治疗是老年人的预防口腔疾病有效方法
D．80岁的老人至少应有20颗功能牙，也就是20颗能够正常咀嚼食物，不松动的牙齿
参考答案：A
Is the world really going mad? 1._____day I was sittng in a restaurant 2._____ a quick drink and a talk with a few friends when it suddenly 3._____ me that almost everyone in the restaurant was smoking. It wasn’t long 4._____ the whole room was 5._____ with smoke. I asked with an apology for 6._____ to open a window to stop myself 7._____! Nowadays air pollution is something that hardly question any more. However, I still can’t walk down the street in any of the big cities without 8._____ that people are 9._____ the air pollution. It is time for the government departments of the world to introduce emission(废气排放) controls on all cars and 10._____ the public transport system(公共交通体系) to encourage people to 11._____ their cars at home. A friend of mine takes flying lesson each morning and it really makes him 12._____ when he climbs above the smog layer(烟雾) and looks down 13._____ it and thinks: “I’m breathing that!” This kind of 14._____ results from the bad management of resources. Waste things can 15._____ should, be treated properly. House building, road 16._____, and industrial development are all earthmoving(or earth-reducing) operations and can change the balances of 17._____ created over millions of years. I would like to 18._____serious studies done on all these main works before they are built. Also, there should be 19._____ national parks set up to keep the most beautiful parts of our countries in their natural 20._____. 小题1:.
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