单项选择题

The upward trend towards more mixed births ______.

A．is influencing the racial barriers in the United States of America
B．is softening the historical isolation of European ethnic immigrants
C．is undergoing subtle shifts
D．is now at work
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单项选择题
Which of the following statements is true according to the passage
A．The number of mixed-race couples decreased from 1970 to 1991.
B．There were more Chinese-white births than Chinese-Chinese births in 1989.
C．Mixed-race births remain a large proportion of all births in the United States.
D．The trend of mixed-race marriage is taking place among all racial and ethnic groups.
单项选择题
Which of the following statements directly supports the main idea of this passage
A．Most mixed births involve one white parent.
B．Between 1968 and 1989, children born to parents of different races increased.
C．Population Today is published by the Population Reference Bureau.
D．There were nearly 5,000 births in 1989.
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