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
According to the passage, heat from Mount Rainier's summit craters rises from ______.
A．crystalline ice
B．firns
C．chambers
D．fumaroles
单项选择题
With what topic is the passage primarily concerned
A．The importance of snowfall for Mount Rainier.
B．The steam caves of Mount Rainier.
C．How ice covers are destroyed.
D．The eruption of Mount Saint Helens in 1980.
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