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
A few simple facts will help you keep cut flowers ______.

A.by
B.in
C.to
D.for
E.


【参考答案】

D
D 解析：文章主要讲的是怎样保持切花的寿命及新鲜度。所以该题应该选择D。