D.Wisdom teeth that only partly break can get bacterial infections.
6.Wisdom teeth should be removed________.
A.when they break through the gums
B.when they are below the gums
C.if they are not well lined or get impacted
D.if they take up enough room in the mouth
7.We can learn from the passage that________.
A.impacted wisdom teeth have the risk of getting infected
B.ancient humans need chewing teeth because of their happy life
C.older adults are the best candidates for wisdom teeth removal
D.more chewing teeth are needed for the diet of modern humans
8.The main purpose of the passage is to________.
A.advise
B.persuade
C.comment
D.introduce
详解答案
课时作业(四十)
Ⅰ.单项填空
1.解析: take advantage of...利用……;make a good impression on sb.给某人留下好印象。
答案: B
2.解析: 由so后面的分句可知,“我”最近资金紧张(tight budget),故选B项。
答案: B
3.解析: 根据and后的分句可知,医生所有的努力都白费了(in vain)。in use在使用;in order有序地;in return反过来。
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