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题目材料:
NUMBER OFIMMIGRANTS TO THE UNITED STATES BY REGION OF LAST RESIDENCE. 1820-1978(in thousands)
In 1978 approximately what was the average (arithmetic mean)number of immigrants to the United states per country of Europe that is represented?
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A360
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B1, 700
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C3, 600
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D19, 000
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E76, 000
C显示答案