问答题

S1. What are earthquake belts

【参考答案】

Areas where earthquakes are mostly likely to occur．
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A．Until he eats it.B．At least thirty minutes.C．All day.D．Less than thirty minutes.
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
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