单项选择题

Passage One Questions 26 to 28 are based on the passage you have Just heard.

A．They take longer to raise.
B．They are sold on the Internet.
C．They are more expensive.
D．They are full of chemicals.

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单项选择题

单项选择题

Passage One Questions 26 to 28 are based on the passage you have Just heard. 您的浏览器不支持 audio 元素。