From this passage, you can see at least ______ kinds of people living in North America are mentioned.

A．They thought the Indians were not friendly to them.
B．They wanted to seize the lands as their own.
C．Because North America was first discovered by them.
D．Because the Indian people liked making war to them.

A．The Negroes came to North America in order to work for the earliest immigrants.
B．The Negroes also belonged to the earliest immigrants to the North America.
C．The Negroes were brought to America by chance.
D．The Negroes didn't win freedom until now.