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

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes,

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

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。