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
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
单项选择题
The phrase the process in the last sentence of paragraph three refers to ________.
A．the recrystallizing process
B．the process to create a glacier
C．the formation of valley glacier
D．the accumulation of tae previous years snow
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