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.

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.

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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
The aging of cut flowers can be slowed down ______.
选项
答案E
解析 第三段讲到通过调节温度控制呼吸，进而影响到切花的寿命，所以应该选温度。
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