单项选择题

The author thinks that pull factors______.
A) are all related to economic considerations C) include a range of considerations
B) are not as decisive as push factors D) are more important than push factors

A．The author thinks that pull factors______.
B．are all related to economic considerations
C．are not as decisive as push factors
D．include a range of considerations
E．are more important than push factors

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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

单项选择题

We can infer from the passage that______.

A．there is little difference between specialization and professionalisation
B．amateurs can compete with professionals in some areas of science
C．amateurs have national academic societies but no local ones
D．professionals welcome amateurs into the scientific community

The author thinks that pull factors______. A) are all related to economic considerations C) include a range of considerations B) are not as decisive as push factors D) are more important than push factors

The author thinks that pull factors______.
A) are all related to economic considerations C) include a range of considerations
B) are not as decisive as push factors D) are more important than push factors