单项选择题

A．Until he eats it.
B．At least thirty minutes.
C．All day.
D．Less than thirty minutes.
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S3. Studies at the Rocky Mountain Arsenal suggest that big, destructive earthquakes can be prevented by
单项选择题
A．Her unique experience.B．Her future prospects.C．Her favourite job.D．Her lonely life.
A．Her unique experience.
B．Her future prospects.
C．Her favourite job.
D．Her lonely life.
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