题目内容
The graduation gown is originally the gown of Christian Mission, and that is a clue of the truth that any university with century history was established by Christ.
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China is one of the world’s most prolific book producers, while Chinese people read books at a relatively high rate.
Compared with the hereditary system, the imperial civil examination was a relatively fair and open method to select officials.
二项分布B（n，p）的期望和方差分别是（ ）
两个函数的和差的导数等于导数的和差
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