单项选择题

According to the passage, icebergs are dangerous because they _________.

A．usually melt quickly
B．Can turn over very suddenly
C．may create immense snowdrifts
D．can cause unexpected avalanches
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单项选择题
The attitude of the author toward icebergs is one of _________.
A．disappointment
B．humor
C．disinterest
D．wonder
单项选择题
According to the passage, icebergs origins from a build-up of _________.
A．turbulent water
B．feathers
C．underwater pressure
D．snowflakes
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