单项选择题

Nancy was surprised that they have ______. They seemed to be a happy couple.

A．split up
B．broken down
C．fallen through
D．knocked out
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单项选择题
The purpose of the passage is to discuss ______.
A．the problems of international migrants
B．the motives of international migrants
C．migration inside the country
D．migration between countries
单项选择题
The author thinks that pull factors ______.
A．are all related to economic considerations
B．are not as decisive as push factors
C．include a range of considerations
D．are more important than push factors
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