单项选择题

Which of the following belongs to "intervening obstacles"

A．Severe famine.
B．Presence of fellow countrymen.
C．Personal factors.
D．Finding a suitable job.
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单项选择题
The direct reason for specialization is______.
A．the development in scientific activities
B．the expansion of scientific knowledge
C．the growth of professionalisation
D．the splitting up of academic societies
单项选择题
The author writes of the development of geology to demonstrate______.
A．the change of policies in scientific publications
B．the difficulties of amateurs in scientific study
C．the process of specialization and professionalisation
D．the discrimination of professionals against amateurs
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