单项选择题

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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单项选择题
The second paragraph uses facts to develop the idea that ______.
A．a plant needs more water than is found in its composition
B．a plant efficiently utilizes most of the water it absorbs
C．the stronger the wind, the more water vapor the plant loses.
D．carbon dioxide is the essential substance needed for plant development
单项选择题
A growing plant needs water for all of the following except ______.
A．forming sugars
B．sustaining actively growing parts as well as woody stems
C．absorbing mineral elements
D．taking in carbon dioxide from the air
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