Earth is mentioned by the author as a necessity for hydroponics. The soilless farming is generally cheaper than traditional pra

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问题 Earth is mentioned by the author as a necessity for hydroponics.
The soilless farming is generally cheaper than traditional practices.

选项 A、Right
B、Wrong
C、Not mentioned

答案B

解析 见最后一段第一句,句中提到soiless farming通常比“。utilizing fertile land”要更贵,可后者即是题中所指的“traditional practices”。
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