Earth is mentioned by the author as a necessity for hydroponics. The original hydroponics gardens merely consisted of plants fl

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问题 Earth is mentioned by the author as a necessity for hydroponics.
The original hydroponics gardens merely consisted of plants floating in inert substances.

选项 A、Right
B、Wrong
C、Not mentioned

答案B

解析 见文中第三段第一句,可知在初期plants并非浮在“inert substances”中,而是在water中。
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