单项选择题
A growing plant needs water for all of the following EXCEPT ______.
A．forming sugars
B．sustaining woody stems
C．keeping green
D．producing carbon dioxide
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单项选择题
This passage is mainly about ______.
A．the functions of carbon dioxide and water
B．the role of water in a growing plant
C．the process of simple sugar formation
D．the synthesis of water with carbon dioxide
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