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The ticket to know-it-all boy is punched "lean".()

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Christmas Eve refers to the night of December 24th.()

蛋白质变性本质是

A. 蛋白质一级结构变化
B. 肽键断裂
C. 疏水键断裂
D. 二硫键断裂
E. 分子空间结构发生变化

Certain kinds of wind can do harm to human health.()

Halloween customs came to the United States from Britain.()