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
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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
单项选择题
According to the passage, heat from Mount Rainier's summit craters rises from ______.
A．crystalline ice
B．firns
C．chambers
D．fumaroles
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