[单项选择]How many states are there in the USA

[单项选择]In the United States, how many years does primary education require（　）.
A. Four years.
B. Five years.
C. Six years.
D. Seven years.

[单项选择]Each of the fifty states in the USA elects （）senators.
A. two
B. three
C. four
D. five

[填空题]How many states got their names from American Indian languages ______ got their names from American Indian languages.

[单项选择]How many families in the United States have computers（　）.
A. One-third.
B. Three-fourths.
C. Half.
D. 60 percent.

[填空题]In the United States many high school shooting, many American schools became equipped with security systems.

[填空题]Of all the states in the USA, _________________ (人口最多的州) is California.

[单项选择]The United States has many different kinds of climates. On the west coast the temperature changes very little between summer and winter, but the north central states have a very different kind of climate. In those states, people wear light clothing during the summer, and they need heavy wool or fur clothing in the winter.In the eastern part of the United States, summer temperatures are very different from winter temperatures. Summers are usually hot, winters are usually cold. Spring temperatures are comfortably warm, and autumn temperatures are pleasantly cool.Years ago, people in the cold parts of the United States didn’t often get fresh vegetables and fruits during the winter. Today, however, trucks and trains deliver fruit and vegetables very efficiently to all parts of the United States. In this way, Americans "send their climates" to people in other states.（）
A. The climate varies a little all over the United States.
B. The climate varies a lot in the United States.
C. There is no variation in climate in the United States.
D. The climate is very pleasant all the year round.

[单项选择]
The United States has many different types of families. While most American families are traditional comprising a father, mother and one or more children, 22.5 percent of all American families in 1983 were headed by one parent, usually a woman. In some families in the United States, there are no children. These childless couples may believe that they would not make good parents; they may want freedom from the responsibilities of child-rearing; or perhaps they are not physically able to have children. Other families in the United States have one adult who is a stepparent. A stepmother or stepfather is a person who joins a family by marrying a father or mother.
Americans tolerate and accept these different types of families. In the United States, people have the right to privacy and Americans do not believe in telling other Americans what type of family group they must belong to. They respect each other’s choices regarding family groups.

W
A. They are too busy with their work.
B. They may not be good parents.
C. They want to be free from the family responsibilities.
D. They are physically unable to have children.

[填空题]Old age in the United States presents many problems and opportunities. As a result of{{U}} (36) {{/U}}medical services, people live longer than they used to. This{{U}} (37) {{/U}}in longevity (寿命) creates a wide range of social needs. The medical{{U}} (38) {{/U}}of gerontology (老年医学) opened up new{{U}} (39) {{/U}}areas and careers related to the elderly. Because of changes in the family structure from{{U}} (40) {{/U}}to nuclear, the elderly have to create{{U}} (41) {{/U}}apart from basically small family units. This situation is{{U}} (42) {{/U}}by the fact that many of their friends may have died and their children may have moved away. The elderly must set up a new life. Often, the elderly must rely on a fixed income--Social Security and{{U}} (43) {{/U}}--and gradually diminished savings.{{U}} (44) {{/U}}. However, the increasing proportion of elderly people in society has given them a new political power.{{U}} (45) {{/U}}. Lobbying (游说) for such issues as