D.more chewing teeth are needed for the diet of modern humans
解析 推理判断题。根据文章第三段可知,阻生智齿(即impacted wisdom teeth)会在牙齿周围给细菌留出进入的空间,这就有被感染的风除。故选A。根据第四段最后一句可排除C项;根据最后一段可排除B、D两项。
答案 A
8.The main purpose of the passage is to________.
A.advise
B.persuade
C.comment
D.introduce
解析 写作意图题。本文是一篇说明文。文章主要介绍了长智齿的大约时间、智齿可能导致的问题、拔掉智齿的时间、为什么长智齿等内容。所以本文写作的主要目的就是介绍。
答案 D
阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项。It’s a popular belief that a fish’s memory lasts for only seven seconds. It may seem sad to think that they don’t remember what they’ve eaten or where they’ve been, and they don’t recognize you or any of their friends --- every moment in their life would be like seeing the world for the first time.
But don’t be so quick to feel sorry for them. A new study has found that fish have a much better memory than we used to think. In fact, certain species of fish can even remember events from as long as 12 days ago.
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