5．According to the passage，which of the following statements is NOT true?

　　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.

　　解析　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。

　　答案　A

　　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

　　解析　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。

　　答案　C

　　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

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