【单选题】The direct reason for specialization is______.
A．the development in scientific activities
B．the growth of professionalisation
C．the expansion of scientific knowledge
D．the splitting up of academic societies
【单选题】The direct reason for specialization is______.
A．the development in scientific activities
B．the growth of professionalisation
C．the expansion of scientific knowledge
D．the splitting up of academic societies
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