题目内容
（请给出正确答案）
[主观题]
Another important way to prolong the life of cut flowers is______ A．by keeping
Another important way to prolong the life of cut flowers is______
A．by keeping its original shape and colour
B．in the life of cut flowers
C．to produce carbon dioxide
D．for aslong as possible
E．by controlling temperature
F．to replace the water and solution every day
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