题目内容：

Immigration is the act of coming to a foreign country to live. The act of leaving one's country to settle in another is called emigration. Immigrants who flee their country because of persecution, war, or such disasters as famines or epidemics are known as refugees or displaced persons. Most people find it very hard to pull up roots in their native land and move to a strange country. But throughout history, countless millions of people have done so. The heaviest immigration worldwide took place from the early 1800's to the Great Depression, the economic hard times of the 1930's. In that period, about 60 million people moved to a new land. Most came from Europe. More than half immigrated to the United States. Other destinations included Canada, Argentina, Brazil, Australia, New Zealand, and South Africa. Today, the availability of fast, safe, and cheap transportation helps make migration easier. Asia is replacing Europe as the major immigrant-sending area. The United States remains the chief receiving nation.

People abandon their homeland and move to another country for various reasons.

The main reason for immigration has long been economic opportunity----the desire for better land or a better job. During the 1800's, for example, the rich prairie land of the United States attracted many European farmers. Today, professional people commonly emigrate because of better opportunities elsewhere. Such emigration has sometimes been called brain drain. Many doctors and nurses and numerous engineers and scientists have moved to the United States.

Religious persecution has led many people to move to a new land for the freedom to practice their faith. Such immigrants include Jews expelled from England in the 1200's.

Wars, revolutions, and political unrest have driven innumerable people to find new homes. In the 1990's alone, millions of refugees fled from warfare in Afghanistan, Iraq, Liberia, Iran, Uganda, Southeastern Asia, and Central America.

Some immigrants were brought to a new land against their will. From the 1500's to the 1800's Europeans shipped black Africans to the Western Hemisphere as slaves. The United Kingdom transported prisoners to Australia from the late 1700s to the 1860s to relieve over crowding in British jails. Before that time, the United Kingdom sent prisoners to the American colonies.

Immigrants have made enormous contributions to the culture and economy of such nations as Australia, Canada, New Zealand the United States. But their accomplishments have been made with great difficulty. At times, the United States, like many receiving countries, has restricted immigration to maintain a more homogeneous society in which all the people share the same ethnic, geographic, and cultural background. Although some immigration laws have been relaxed, many new comers of different backgrounds still face challenges in gaining acceptance.

1.Most Immigrants to the United States in the nineteenth century came from _______.

A. Europe        B. Asia          C. Australia     D. South Africa

2.There are altogether______ reasons  of immigration listed in the passage.

A.2              B.3              C. 4             D. 5

3.The main reason for immigration is __________according to the passage.

A. slavery trade                      B. religious persecution

C. economic opportunity               D. political unrest

4.In the last paragraph ,“a homogeneous society” is one in which__________.

A. immigration  laws  have been relaxed.

B. people from different backgrounds live harmoniously together.

C. a brain drain occurs.

D. people share the same ethnic, geographic, and cultural backgrounds.