单项选择题

What topic is the passage mainly concerned with

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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单项选择题

In the last paragraph, smothering the present caverns means that they would be ______.

A．eliminated
B．enlarged
C．prevented
D．hollowed

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