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

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

Which of the following are expected to write good diaries by the author

A．Those who are satisfied with their life.
B．Those who are satisfied with themselves.
C．Those who let things pass into oblivion.
D．Those who have something to calm down.

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