【单选题】
The number of specialists has enormously increased mainly because of_________.
A.academic mobility
B.interdisciplinary research
C.specialization
D.modernization of transportation
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根据网考网移动考试中心的统计,该试题:
8%的考友选择了A选项
37%的考友选择了B选项
5%的考友选择了C选项
50%的考友选择了D选项