2. 外语
  3. From 1948 to 1961, the proportion of American blacks earning less than $ 3000 a year declined from 78 to 47 percent; at the same

From 1948 to 1961, the proportion of American blacks earning less than $ 3000 a year declined from 78 to 47 percent; at the same

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问题 From 1948 to 1961, the proportion of American blacks earning less than $ 3000 a year declined from 78 to 47 percent; at the same time, blacks earning more than $10.000 increased ______ from less than 1 to 17 percent. (Proportion)
选项
答案proportionally
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