【单选题】"Snowball Earth" might have occurred as a result of ______.
A．ice reflecting sunlight and heat
B．the growth of polar ice sheets
C．the increase of rainfall
D．the huge loss of carbon dioxide
【单选题】"Snowball Earth" might have occurred as a result of ______.
A．ice reflecting sunlight and heat
B．the growth of polar ice sheets
C．the increase of rainfall
D．the huge loss of carbon dioxide
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