Wisdom teeth are normally the last teeth to appear．This usually happens when people are in their late teen years or early twenties.in other words.when they are older and wiser．Wisdom teeth can grow 题目和参考答案——青夏教育精英家教网—

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19．Wisdom teeth are normally the last teeth to appear．This usually happens when people are in their late teen years or early twenties，in other words，when they are older and wiser．
Wisdom teeth can grow into place normally and never cause a problem．But often there is not enough room for them in the mouth； they might crowd other teeth．Sometimes they even push sideways through the gums （齿龈）
An impacted wisdom tooth is one that fails to completely rise through the gums．Wisdom teeth that only partly break through can leave space for bacteria to enter around the teeth．Infection （感染） is a risk in these cases．
Wisdom teeth that are not well lined and become impacted are often removed．The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums．Removal is also advised if there is a chance that wisdom teeth are poorly lined．The best time to remove is before the teeth cause any problems or pain．Young adults are the best candidates for wisdom teeth removal．
But why do we have wisdom teeth if we often need to get them removed？One theory has to do with our diets．Scientists say the diet of ancient humans probably required more chewing teeth．Life was probably a little rougher on the teeth back then，too．So it was good to have extras．
68．According to the passage，which of the following statements is NOT true？A
A．Just older and wiser people can have wisdom teeth
B．Wisdom teeth can cause problems if not in their right place
C．Impacted wisdom teeth can't grow out of the gum fully
D．Wisdom teeth that only partly break can get bacterial infections
69．Wisdom teeth should be removedC
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
70．We can learn from the passage thatA
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
71．The main purpose of the passage is toD
A．advise B．persuade C．comment D．introduce．

分析本文是一篇说明文．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．

解答 68．A．细节理解题．根据文章第一段可知，所谓的智齿是指在青少年晚期或二十岁出头长出的牙齿，而不是只有老人或智者才有的牙齿．故选A．
69．C．细节理解题．根据文章第四段第一句"Wisdom teeth that are not well lined and become impacted are often removed．"可知，C项正确．
70．A．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．故选A．
71．D．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．故选D．

点评本篇文章主要是细节理解方面的题型，需要考生通过跳读迅速找到对应的句子进行详细理解，句子的理解可以结合上下文意思，通过逻辑推理得到．

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