【预览选项】

14. [A]Coca Cola.

[B]Sausage.

[C]Milk.

[D]Fried chicken.

15. [A] He has had thirteen decayed teeth.

[B]He doesn’t have a single decayed tooth.

[C]He has fewer decayed teeth than other people of his age.

[D]He never had a single tooth pulled out before he was fifty.

16. [A] Brush your teeth right before you go to bed in the evening.

[B]Have as few of your teeth pulled out as possible.

[C]Have your teeth X-rayed at regular intervals.

[D]Clean your teeth shortly after eating.

【听前预测】

14．由15、16题各选项内容可推测本文主题应该是关于牙齿保健。而本题选项都是食物或饮料，结合对文章主题的分析，本题很可能是问哪种东西对牙齿有害。根据常识，四种食物或饮料中Coca Cola最容易伤害牙齿，因为其含糖量较高。

15．选项表明本题考查的是某人的牙齿状况（是否有蛀牙）。[A]、[B]、[C]都是关于蛀牙的问题，[D]则是关于拔牙的问题，故可初步排除。

16．选项表明本题考查的是保护牙齿的正确方法。根据对前两题的分析可推知，本题很可能是关于预防蛀牙的方法，并且很可能与饮食有关。因此[B]、[C]为答案的可能性较小；而[A]、[D]为答案的可能性较大。

【听音验证】

How many teeth have you had filled in the past 2 years? If you follow the advice of Dr. Forstic, you may be able to reduce the number of your visit to a dentist. Dr. Forstic conducted a two-year survey to find out how to prevent or reduce dental decay. 946 students took part in the experiment. 523 students cleaned their teeth within 10 minutes of eating. When possible, they used toothbrush. When this was impossible, they washed their mouth thoroughly with water. The remaining 423 students merely cleaned their teeth when they went to bed and when they got up in the morning. All the students had their teeth X-rayed at the end of the first and second years. At the end of the first year, the night-and-morning group had three times as many decayed teeth as the clean-after-each-meal group. At the end of the second year, the latter group had 53% fewer decayed teeth than the former group. [15B] Dr. Forstic has cleaned his teeth after every meal for 13 years, and has not had a single decayed tooth. [14A]He pointed out that sugar is a major agent in dental decay, particularly the sugar in sweets, cakes and soft drinks. Ideally, [16D]you should keep a toothbrush in your pocket and use it immediately after you have finished eating. When this is impractical, you can at least make sure that you have a drink of water and let the water through your teeth, to force out any particles of food. Seven out of ten people lose at least half their teeth by the time they are fifty. Many have a complete set of false teeth by that time. In any case, neither toothache nor a visit to a dentist is very pleasant. So, it is worthwhile making an effort to keep your own teeth as long as possible. The main preventive agent is simply water.

【答案解析】

14. According to the passage, what type of food or drink is most likely to cause dental decay?

【解析】 选[A]。细节题。根据原文中“ sugar is a major agent in dental decay, particularly the sugar in sweets, cakes and soft drinks.”而 Coca Cola 是soft drinks中的一种，故答案为[A]。

15. What does the passage tell us about the condition of Doctor Forstic’s teeth?

【解析】 选[B]。细节题。根据原文中Dr. Forstic has cleaned his teeth after every meal for 13 years, and has not had a single decayed tooth.可知Dr. Forstic没有一颗蛀牙，故答案为[B]。

16. What does Doctor Forstic suggest to prevent dental decay?

【解析】 选[D]。细节题。根据原文中you should keep a toothbrush in your pocket and use it immediately after you have finished eating.可知饭后保持牙齿的清洁是防止蛀牙的有效方法，故答案为[D]。