单项选择题

Prejudice and discrimination _______.

A．were gone
B．have been existing in the American society
C．don't exclude new immigrants from participation in the society
D．are mainly caused by the slavery

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单项选择题

The attitude of the author is ______.

A．favorable
B．praising
C．indifferent
D．sarcastic

单项选择题

One of the reasons why black Americans could not easily mix in American society is ______.

A．that most Americans are immigrants
B．due to their skin color
C．that they speak their language differently from Americans
D．that they were free to keep their heritage