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 （齒齦）
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．a(chǎn)ncient 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．a(chǎn)dvise             B．persuade             C．comment              D．introduce．

分析 本文是一篇說明文．文章主要介紹了長智齒的大約時間、智齒可能導(dǎo)致的問題、拔掉智齒的時間、為什么長智齒等內(nèi)容．

解答 68．A．細(xì)節(jié)理解題．根據(jù)文章第一段可知，所謂的智齒是指在青少年晚期或二十歲出頭長出的牙齒，而不是只有老人或智者才有的牙齒．故選A．
69．C．細(xì)節(jié)理解題．根據(jù)文章第四段第一句"Wisdom teeth that are not well lined and become impacted are often removed．"可知，C項正確．
70．A．推理判斷題．根據(jù)文章第三段可知，阻生智齒（即impacted wisdom teeth）會在牙齒周圍給細(xì)菌留出進(jìn)入的空間，這就有被感染的風(fēng)除．故選A．根據(jù)第四段最后一句可排除C項；根據(jù)最后一段可排除B、D兩項．故選A．
71．D．寫作意圖題．本文是一篇說明文．文章主要介紹了長智齒的大約時間、智齒可能導(dǎo)致的問題、拔掉智齒的時間、為什么長智齒等內(nèi)容．所以本文寫作的主要目的就是介紹．故選D．

點評 本篇文章主要是細(xì)節(jié)理解方面的題型，需要考生通過跳讀迅速找到對應(yīng)的句子進(jìn)行詳細(xì)理解，句子的理解可以結(jié)合上下文意思，通過邏輯推理得到．

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科目：高中英語 來源： 題型：閱讀理解

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