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  3. During the past 20 years, the number of mixed-raced births has increased noticeably in the United States, according to the Popul

During the past 20 years, the number of mixed-raced births has increased noticeably in the United States, according to the Popul

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问题     During the past 20 years, the number of mixed-raced births has increased noticeably in the United States, according to the Population Reference Bureau (PRB). Between 1968 and 1989, children born to parents of different races increased from 1% of total births to 3.4%.
    U.S. Census Bureau data show that, mirroring changes in laws and attitudes from 1970 to 1991, the number of mixed-race married couples increased from 310,000 to 994,000. PRB researchers observe that this trend is taking place among all racial and ethnic groups, but the patterns for each group are distinctly different.
    "Most mixed births involve one white parent, but by no means all," writes Kalish in PRB’s journal, Population Today. "For example, there were nearly 5,000 births in 1989 where one parent was black and the other parent was of another race other than white."
    For black and white parents, births increased from 8,700 in 1968 to 45,000 in 1989. There has also been an increase in births to Japanese and white parents, Kalish notes. In fact, there are now 39% more births to Japanese-white parents than births to Japanese-Japanese parents.
    Between 1968 and 1989, Chinese-white births more than tripled (from 1,000 to over 3,800), as did births to Chinese-Chinese parents (from 4,600 to about 17,100), Kalish notes.
    "With almost 97% of births occurring to parents of the same race, mixed-race births remain a small proportion of all births," says Kalish. "Still, the upward trend towards more mixed births is a sign that the social meaning of race in the United States may be undergoing subtle shifts. It suggests that forces similar to those that softened the historical isolation of European ethnic immigrants over time may now be at work making somewhat more permeable(可渗透的)the stubborn barriers of race."
Which of the following statements is true according to the passage?
选项 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.
答案D
解析 文章第二段提到异族通婚的数量呈上升趋势，而且这种趋势发生在所有的人种和种族之间。但文章第五段指出尽管华裔与白种人所生孩子的数量翻了三倍之多，但华裔与华裔之间所生的孩子数量仍然比之更多。文章最后一段还指出异族通婚所生的孩子目前仍然只占所有在美国出生的孩子的一小部分。
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