题型分类：事实信息题

原文定位：根据North American frog and toad species定位到“with approximately one-third of their body fluids frozen”这一句。

选项分析：

D选项：原文说The other tissues被保护起来了，因为（because）它们含有the frost-protective agents glycerin or glucose，与D选项对应。

A选项：原文说的是with a body temperature of -6ºC with approximately one-third of their body fluids frozen 而不是temperatures never fall below -6ºC，与原文相反。

B选项：原文说的是can survive up to five days而不是do not remain，与原文相反。

C选项：Their tolerance boundaries对应的是a result of acclimatization，张冠李戴。