14. C　根据I took a cup of coffee with me to my next class.可知，此处是说作者也在上课的时候喝(drank)咖啡。

　　15. B　根据后文but gave me time to think about what I was going to say next可知作者喝咖啡的时候不仅给了学生思考的时间，也给自己思考接下来说什么留足了时间。

　　16. B　根据My pauses, as I drank the coffee可知作者利用暂停的空当看学生的反应。pause中止，暂停。

　　17. A　根据I tried to bring them back.可知此处应表示“当我看见他们的注意力(attention)不集中时”。

　　18. C　根据后文I gave another example.可知，此处应表示“当我看见他们对我刚才解释的(explained)某个概念仍迷惑不解时”。

　　19. D　根据全文可知作者是在大学授课，故应选lecture讲座。

　　20. B　尽管我的课不再那么紧凑、精彩，但我的学生理解得(understand)更好了。

　　.阅读理解

　　It might seem hard to imagine that a bad tooth could be deadly. But doctors in the Washington area say a twelve­year­old boy died last month of a tooth infection that spread to his brain. They say it might have been prevented if the boy had received the dental care he needed.

　　Experts at the National Institutes of Health say good dental care should start at birth. They say breast milk is the best food for the healthy development of teeth. Breast milk can help slow bacterial growth and acid production in the mouth.

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