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
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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
单项选择题
The author seems to indicate that______
A．there are many controversial issues like the right amount of sleep
B．among many issues the right amount of sleep is the least controversial
C．people are now moving towards solving many controversial issues
D．the right amount of sleep is a topic of much controversy among doctors
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