单项选择题

Most of the dreadful eruptions of Mount Saint Helens took place in early May.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
Pilots flying at the height of more than 2,100 meters saw a thick black column of ash and steam shooting up into the air from the crater.
A． Right
B． Wrong
C． Not mentioned
单项选择题
A new crater, which was to the south of the old one, was formed after the second eruption.
A． Right
B． Wrong
C． Not mentioned
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