【单选题】The essential function of photosynthesis in terms of plant needs is ______.
A．to derive energy from light
B．to preserve water
C．to combine carbon dioxide with water
D．to form sugars
【单选题】The essential function of photosynthesis in terms of plant needs is ______.
A．to derive energy from light
B．to preserve water
C．to combine carbon dioxide with water
D．to form sugars
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