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
According to the passage, icebergs origins from a build-up of _________.
A．turbulent water
B．feathers
C．underwater pressure
D．snowflakes
单项选择题
Which of the following is the best title for the passage
A．The Melting of Icebergs
B．The Nature and Origin of Icebergs
C．The Size and Shape of Icebergs
D．The Dangers of Icebergs
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