单项选择题

According to the passage long periods of volcanic inactivity can lead to a volcanic cone's ______.

A．strongest eruption
B．sudden growth
C．destruction
D．unpredictability
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单项选择题
In line the last sentence of the third paragraph smothering the caverns means that they would be ______.
A．eliminated
B．enlarged
C．prevented
D．hollowed
单项选择题
The second paragraph mentions all of the following as necessary elements in the creation of steam caves EXCEPT ______.
A．a glacier
B．a crater
C．heat
D．snow
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