问题补充：
Most people in America live in small family groups. More than a quarter of homes in America have only got one person in them. Some of these are old people but some are people of twenty or thirty years old who would like to live alone. 35％ of homes have two people in them, and another 17％ have three people. 15％have four people in them, and the other homes have five or more.
The families in America are small. It is unusual for parents to have more than two children. When children are about eighteen or nineteen years old, they leave their parents’ homes, and they often go to different cities. Sometimes they only visit their parents two or three times a year.
【小题1】How many people in America have 3 people living in them?A．17%B．15%C．35%D．5%【小题2】At what age do children in America usually go away from. heir parents’ homes？A．About 30 or 31B．About 20 or 21C．About I ? or lessD．About 18 or 19【小题3】 What is the passage?A．A traveling story B．A report C．An inventionD．A jokeA
答案：
(答案→)A
解析：这篇短文中作者主要介绍了美国人的家庭成员数量和孩子们与父母的关系及回家看父母的次数等基本情况。
【小题1】细节理解题。根据短文第一段35％ of homes have two people in them, and another 17％ have three people.可知，大约有17%的美国人三人一组在一起生活；故选A。
【小题2】细节理解题。根据短文第二段When children are about eighteen or nineteen years old, they leave their parents’ homes可知许多孩子在十八九岁时就离开父母到别的城市生活；故选D。
【小题3】细节理解题。根据短文内容可知，本文的主要内容就是介绍美国人的家庭成员数量和孩子们与父母的关系及回家看父母的次数等，所以应该是一篇报道；故选B。
