单选题:Another important way to prolong the life of cut flowers is

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题目内容:
Another important way to prolong the life of cut flowers is ____________________ A.by keeping its original shape and colour
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
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答案解析:

The aging of cut flowers can be slowed down_________________

The aging of cut flowers can be slowed down_________________

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