填空题 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

填空题 A few simple facts will help you keep cut flowers______.

填空题 Respiration plays a key role______.

填空题 The aging of cut flowers can be slowed down______.

填空题 Another important way to prolong the life of cut flowers is______.