2. 外语
  3. A. by keeping its original shape and color B. in the life of the cut flower C. tO produce carbon dioxide D. for as l

A. by keeping its original shape and color B. in the life of the cut flower C. tO produce carbon dioxide D. for as l

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问题     A. by keeping its original shape and color
    B. in the life of the cut flower
    C. tO produce carbon dioxide
    D. for as long as possible
    E. by controlling temperature
    F. to replace the water and solution every day
Another important way to prolong the life of cut flowers is ______.
选项
答案F
解析 文章最后一段主要谈论另一种延长切花寿命的方法和保鲜切花的另一个重要因素：“盛放切花水的质量问题。”因此，本题答案是F，即每天换水是另一种延长切花寿命的方法。
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