单项选择题

We can tell the difference between a glacier and a mere mass of ice by ________.

A．the thickness of the ice
B．the movement of the ice
C．the weight of the ice
D．the amount of ice
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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.
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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