高级视听说教程(第二版)课后答案

Unit1

1. Most countries take a census every ten years or so in order to count the people and to know where they are living.

2. A country with a growing population is a country that is becoming more populous.

3. A person’s race is partly determined by skin color and type of hair as well as other physical characteristics.

4. The majority of the U.S. population is of European origin.

5. The geographical distribution of a country’s population gives information about where the people are living.

6. The total population of the United States is made up of many different kinds of people.

7. In other words, the population comprises people of different races and ages.

8. The average age of the U.S. population, which is a relatively large one, has been getting progressively higher recently.

9. Metropolitan areas are more densely populated than rural areas. That is, they have more people per square mile.

10. The use of antibiotics has greatly decreased the death rate throughout much of the world.

11. A country whose birth rate is higher than its death rate will have an increasing population.

12. On the average, women have a higher life expectancy than men do.

Unit2

1.Throughout history, people have moved, or immigrated, to new countries to live.

2.Natural disasters can take many forms：those that are characterized by a shortage

of rain or food are called droughts and famines respectively.

3.Sometimes people immigrate to a new country to escape political or religious

persecution.

4.Rather than immigrants, the early settlers from Great Britain considered

themselves colonists; they had left home to settle new land for the mother country.

5.The So-called Great Immigration, which can be divided into three stages, or time

periods, began about l830 and lasted till about 1930.

6.The Industrial Revolution, which began in the eighteenth century, caused

widespread unemployment as machines replaced workers.

7.The scarcity of farmland in Europe caused many people to immigrate to the United

States, where farmland was more abundant.

nd in the United States was plentiful and available when the country was

expanding westward. In fact, the U.S. government offered free public land to citizens in 1862.

9.The failure of the Irish potato crop in the middle of the nineteenth century

caused widespread starvation.

10.The Great Depression of the 1930s and World War II contributed to the noticeable

decrease in immigration after 1930.