单项选择题

"Greenhouse gases" in Para. 2 refer to ______.

A．oxygen
B．hydrogen
C．carbon dioxide
D．air
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单项选择题
Which of the following statements is NOT true according to the passage
A．Today's continents might have originated from the same supercontinent.
B．The increased rainfall was responsible for the weathering of rock.
C．Rodinia split owing to the eruption of volcanic rock.
D．Rock weathering involves the loss of carbon dioxide.
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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