2. 外语
  3. A.by keeping its original shape and color B.in the life of cut flowers C.to produce carbon dioxide D.for as long as possible E.b

A.by keeping its original shape and color B.in the life of cut flowers C.to produce carbon dioxide D.for as long as possible E.b

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问题 A.by keeping its original shape and color
B.in the life of cut flowers
C.to produce carbon dioxide
D.for as long as possible
E.by controlling temperature
F.to replace the water and solution every day
Respiration plays a key role______.
选项
答案B
解析 本题其实与上题意思相似,都是在说呼吸的作用。通过对上题的分析,我们知道呼吸在花朵一生中起到重要作用,选项B符合题意,故选B。
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