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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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.
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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