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
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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
单项选择题
The quakes recorded during the first week of April in the area of Mount Saint Helens warned scientists of a new eruption.
A． Right
B． Wrong
C． Not mentioned
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