单项选择题

"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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单项选择题
Greenhouse gases in Para. 2 refer to ________________.
A．oxygen
B．hydrogen
C．carbon dioxide
D．air
单项选择题
The theory about a Snowball Earth is significant in that it can _____________.
A．decode the mystery of life
B．predict the formation of a new supercontinent
C．adjust the planet's climate
D．prevent another Snowball Earth from happening
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