Earth is mentioned by the author as a necessity for hydroponics. It was discovered that roots could survive in many different k

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问题 Earth is mentioned by the author as a necessity for hydroponics.
It was discovered that roots could survive in many different kinds of materials.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析文中第三段第二句说植物的根能够在一些media中成长，根据上下文可推断句中的media与“materials”同义。

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