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
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
单项选择题
A．composeB．make upC．consistD．constitute
A．compose
B．make up
C．consist
D．constitute
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