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Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against disease.

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From the passage, we can deduce that the main purpose of most wrapping is to ______.

单项选择题

Passage ThreeQuestions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。