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 冰魂雪魄populous.
3. A person’s race眉间有一条竖纹 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.
酸甜咕噜肉 7. In other words, the population compris 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 denly populated than rural areas. That is, they have more people per square mile.
10. The u of antibiotics has greatly decread the death rate throughout much of the world.
11. A country who 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图形英语 can take many forms：tho that are characterized by a shortage of r
ain or food are called droughts and famines respectively.
3.Sometimes people immigrate to a new country to escape political or religious percution.
4.Rather than immigrants, the early ttlers from Great Britain considered themlves colonists; they had left home to ttle 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, caud widespread unemployment动漫福利图 as machines replaced workers.
7.The scarcity of farmland in Europe caud many people to immigrate to the United States, where farmland was more abundant.
8.Land in the United States was plentiful and available when the country was expandin
g 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 caud widespread starvation.
10.The Great Depression of the 1930s and World War II contributed to the noticeable decrea in immigration after 1930.
11.The first law that limited the number of immigrants coming from a certain part of the world was the Chine Exclusion Act of 1882.
12.It is important to note that in 1965 strict quotas天安门英语 bad on nationality were eliminated.
13.At the end of the 1940s immigration began to increa again and has, in general, rin steadily since then.
14.Will the trend continue for non-Europeans to immigrate to the United States?
15.The U.S. immigration laws of today in general require that new immigrants have the sk
ills necessary to succeed in the United States becau industry no longer requires large numbers of unskilled workers.
Unit 3
1. As we look at the changes over the last century, we’ll u a lot of statistics to describe the changes.
2. While the number of people in the goods producing industries went down, the number of people in the rvice industries went up.
3. Over the years, child labor laws became much stricter and by 1999, it was illegal for anyone under sixteen to work full-time in any of the fifty States.
实盘炒股大赛4. In 1900 the average per capita income was $4, 200.
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5. One of the important benefits most workers received later in the century was health insurance.
6. Whereas wages and salaries ro over the century, the average workweek dropped.
7. People often tend to romanticize the past and talk about “the good old days.”
8. According to a 2003 study relead by the United Nations International Labor Organization, U. S. workers are the most productive in the world.
9. Longer working hours in the United States is a rising trend, while the trend in other industrialized countries is the opposite.
10. Workers in some European countries actually outproduce American workers per hour of work.
11. This higher rate of productivity might be becau European workers are less stresd than U. S. workers.
