单项选择题

The growth of specialization in the 19th century might be more clearly seen in sciences such as ______.

A．sociology and chemistry
B．physics and psychology
C．sociology and psychology
D．physics and chemistry
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单项选择题
We can infer from the passage that ______.
A．there is little distinction between specialization and professionalisation
B．amateurs can compete with professionals in some areas of science
C．professionals tend to welcome amateurs into the scientific community
D．amateurs have national academic societies but no local ones
单项选择题
The direct reason for specialization is ______.
A．the development in communication
B．the growth of professionalisation
C．the expansion of scientific knowledge
D．the splitting up of academic societies
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