单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．The ultimate content remains the same.
B．The vitamin content is reduced.
C．The food becomes poisonous.
D．Vitamin is added to the food.

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单项选择题

单项选择题

Passage Two Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。