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 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

单项选择题

We learn from the passage that the author______

A．comments on three different opinions
B．favours one of the three opinions
C．explains an opinion of his own
D．revises someone else's opinion