单项选择题

Which of the following is not the reason for the growth of specialization

A．Accumulation of scientific knowledge.
B．Convenience for future research.
C．Easy handling of information.
D．The development of communication.
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单项选择题
The purpose of the passage is to discuss______.
A．migration between countries
B．migration inside the country
C．the reasons of international migrants
D．the problems of international migrants
单项选择题
The author thinks that pull factors______.
A．are all related to economic considerations
B．include a range of considerations
C．are not as decisive as push factors
D．are more important than push factors
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