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
B
A、B、C和D)中,选出最佳选项。
It must be something that many American companies hold a baby contest. Of course, babies are wonderful, and many parents would be the first to agree. Companies really bring in much money.
Walgreens Baby contest
If you play the new Baby Milestones Challenge Contest by BabyCenter & Walgreens, you could win $1,000 in Walgreens & Beauty.com Gift Cards and Certificates. You can play the instant winner if you get a $25 Walgreen’s gift card, but you also have to write down your email address and receive all their sales and other information for the contest.
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