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昆虫的前翅着生在胸部的第[ 填空题(1) ]节上。
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The ratio between the urban and rural population of the Qing dynasty assumed by Bao Shichen was about 1:5, while the real ratio by Cao Shuji was that city population took up [填空1]% to [填空2]% of the total population. (use numbers to fill in.)
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