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

An appropriate title for this passage might be ______.

A．The Functions of Keeping a Diary
B．Why I Keep a Diary
C．Calming Down
D．How to Keep a Diary

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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