单项选择题

Questions 27—30 are based on the following interview on freezing humans. You now have 20 seconds to read Questions 27—30.
According to Professor Morgan, what enables animals to survive being frozen

A．A certain chemical in their bodies.
B．The change of certain circumstances mound them.
C．A certain temperature.
D．A certain season in the year.

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Questions 27—30 are based on the following interview on freezing humans. You now have 20 seconds to read Questions 27—30. According to Professor Morgan, what enables animals to survive being frozen 您的浏览器不支持 audio 元素。