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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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

In the last paragraph the author points out that______

A．sleeping less is good for human development
B．people ought to be persuaded to sleep less than before
C．it is incorrect to say that people sleep too little
D．those who can sleep less should be encouraged