評論
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【例2】
【預覽選項】
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.
【聽前預測】
14．由15、16題各選項內容可推測本文主題應該是關于牙齒保健。而本題選項都是食物或飲料，結合對文章主題的分析，本題很可能是問哪種東西對牙齒有害。根據常識，四種食物或飲料中Coca Cola最容易傷害牙齒，因為其含糖量較高。
15．選項表明本題考查的是某人的牙齒狀況（是否有蛀牙）。[A]、[B]、[C]都是關于蛀牙的問題，[D]則是關于拔牙的問題，故可初步排除。
16．選項表明本題考查的是保護牙齒的正確方法。根據對前兩題的分析可推知，本題很可能是關于預防蛀牙的方法，并且很可能與飲食有關。因此[B]、[C]為答案的可能性較小；而[A]、[D]為答案的可能性較大。
