2. 外语
  3. Earth is mentioned by the author as a necessity for hydroponics. According to the passage, the higher cost would be a good reas

Earth is mentioned by the author as a necessity for hydroponics. According to the passage, the higher cost would be a good reas

admin2012-09-10  92
问题 Earth is mentioned by the author as a necessity for hydroponics.
According to the passage, the higher cost would be a good reason not to use hydroponics.
选项 A、Right
B、Wrong
C、Not mentioned
答案A
解析 文中最后一段提到无土栽培法的一个缺点是higher cost，可以推知这是我们不用无土栽培法的原因。
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