Read the passage carefully. Then answer the questions that follow.

The American family unit is in the process of change. In the first half of the 20th century, there were mainly two types of families: the extended and the nuclear. An extended family includes a mother, father, children, and other relatives living in the same house. A nuclear family is composed of just parents and children living under the same roof.

As the American economy progressed from agricultural to industrial, people were forced to move to different parts of the country to get good jobs. These jobs were mainly in the large cities. Three-quarters of Americans live in urban areas that occupy 2.5% of the national total landmass. Of the 118 million in the labour force, only 3 million still work on the farm.

Since moving for better jobs has often divided the extended family, the nuclear family has become more popular. At present, 55% of the families in the US are nuclear families. But besides the two types of traditional family groupings, the family is now being expanded to include various other living arrangements because of divorce. There is an increase in single-parent families, in which a father or mother lives with one or more children. Divorce has also led to blended families, which occur when previously married men and women marry again and combine the children from the former marriage into a new family. Some couples do not want to have children to form two-person childless families.

1. A nuclear family is one that ___.
(A) consists of father, mother, and children living in the same house
(B) relatives live with
(C) there are only grandparents, parents and their children living in
(D) is bigger than extended family
Your answer:

2. The expression "under the same roof" means ___.
(A) a house with one roof
(B) a house with the roof the same as the wall
(C) in the same building
(D) under the house
Your answer:

3. The nuclear family becomes more popular because of ___.
(A) more divorces
(B) the division of the extended family
(C) fewer jobs in big cities
(D) an increase in single-parent families
Your answer:

4. How many types of families have there been in the US since the first half of the 20th century?
(A) Two
(B) Three
(C) Four
(D) Five
Your answer:

5. A blended family is a newly-formed family ___.
(A) with the combination of children of the two previously married father and mother
(B) that has only father or mother living with children
(C) in which there are no children
(D) that only one couple is living in with their newborn children
Your answer: