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
According to the author, the following EXCEPT ______ are good reasons for keeping a diary.
A．retaining one's own excitement
B．recording one's private matters
C．overcoming one's shyness
D．helping one calm down
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