A、Where the Americans came from. B、The size of the American population. C、Land in United States. D、American Indians. A

There is a great deal of land in the United States, but there are also a great many people. Where did the people come from? The first Americans were Indians. Today there are about 900 000 American Indians. There is one part of the country with an especially large Indian population. That is the southwest. Blacks first came to America from Africa as slaves. President Lincoln freed the slaves in 1863. About 11% of the present population is blacks. The first immigrants in American history came from England and the Netherlands. Soon immigrants began to arrive from many other countries. And they are still arriving. In 1790s the new nation had fewer than four million people. Today there are more than 210 million. These include people from all parts of the world.
Questions 18 to 20 are based on the passage you have just heard.
18. What might be the best title for this passage?
19. Who were the first people living in America?
20. What is the current size of the American population?