Earth is mentioned by the author as a necessity for hydroponics. The passage mainly discusses how to control plant growth.

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问题 Earth is mentioned by the author as a necessity for hydroponics.
The passage mainly discusses how to control plant growth.

选项 A、Right
B、Wrong
C、Not mentioned

答案B

解析本题说的是文章的主题，作为主题应有概括性，how to control plant growth的内容文中提及，但非主题，主题就是“soiless gardening”。

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