单项选择题

The crucial function of photosynthesis in terms of plant needs is______.

A．to form sugars
B．to combine carbon dioxide with water
C．to preserve water
D．to derive energy from light
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单项选择题
Will the author move to the country
A．Yes, he will.
B．It is difficult to tell.
C．No, he will not.
D．He is not sure.
单项选择题
According to the passage, which of the following statements is TRUE
A．The mineral elements will not be absorbed by the plant unless they are dissolved in its root.
B．The stems contain more water than the leaves.
C．Air around the leaf is found to be saturated.
D．Part of the carbon dioxide in the plants is synthesized.
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