【单选题】
In the second paragraph, the author talks about______.
A.conclusions reached by the U.N. study
B.Rafael M. Salas's personal opinions about the future
C.the rate of population growth
D.a flood of migration from rural areas
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根据网考网移动考试中心的统计,该试题:
89%的考友选择了A选项
3%的考友选择了B选项
2%的考友选择了C选项
6%的考友选择了D选项