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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．

1．How many homes in America have 3 people living in them?

A．17%                          B．15%                       C．35%                       D．5%

2．At what age do children in America usually go away from their parents' homes?

A．About 30 or 31．                                    B．About 20 or 21．

C． About 17 or less．                                       D．About 18 or 19．

3．What is the, passage?

A．A travelling story．                                     B．A report．

C．An invention．                                           D．A joke．

4．What does the passage mainly tell us?

A．Families in America．

B．Young people in America．

C．Old people in America．

D．The American population．

5．According to the passage, which of the diagrams (圖表) is right?