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
Which of the following is wrong about professionals and amateurs
A．No clear-cut distinction can be drawn between professionals and amateurs in science.
B．Amateurs' participation into scientific research has become more difficult.
C．There is no discriminations of professionals against amateurs in geology.
D．Entrance to professional geological journals has become harder for amateurs.
单项选择题
The author writes of the development of geology to demonstrate ______.
A．the process of specialization and professionalisation
B．the hardship of amateurs in scientific study
C．the change of policies in scientific publications
D．the discrimination of professionals against amateurs
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