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
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
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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