单项选择题

Which of the following word can best explain the word "critical" on the second line, paragraph 4

A．Crucial.
B．Looking for faults.
C．Great.
D．Dangerous.
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单项选择题
In order to describe the development of glaciers, the author uses the analogy of ________.
A．creation
B．birth
C．recrystallization
D．gestation
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