发布时间 : 星期三 文章(全国用)2018版高考英语大一轮复习 Unit 4 Sharing课时作业 新人教版选修7更新完毕开始阅读fd55b6caf11dc281e53a580216fc700aba685276
确。A、C项是在children’s hospitals可以做的事，B项是在homeless shelters可以做的事。 答案 D
2．What can we learn about the volunteering?
A．You can only volunteer during the holidays. B．You can help prepare meals in a nursing home. C．It is easy to find a homeless shelter to volunteer. D．Help is needed everywhere in a homeless shelter.
解析 细节理解题。根据文中的“There is a homeless directory online that anyone can easily access to find the closest homeless shelter to their home.”可知，人们很容易找到一个能在里面做志愿活动的流浪者之家。其他三项都是与文章内容不符。 答案 C
3．In a children’s hospital，which of the following is true?
A．Over 50% of those living there do not have relatives. B．A personal visit brings happiness to a sick boy. C．Children live a lonely and frightening life. D．Children love listening to volunteers’ reading.
解析 细节理解题。根据文中Volunteering in Children’s Hospitals部分的描述可知B项正确，A、C两项错误，D项文中未提及。 答案 B
4．The best title for the passage would be________.
A．Giving of oneself cheers others B．Volunteering is a way of life C．Volunteering during the holidays D．Giving is better than taking
解析 主旨大意题。全文主要介绍了假期中人们可以选择去做志愿活动的三个地方。故C项作为本文的标题最佳。 答案 C
B
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 ate 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.
【语篇解读】 本文是一篇说明文。文章介绍了智慧之牙——智齿。
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
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 C．comment
B．persuade 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