单项选择题

A．Travel a lot when young.
B．Be more responsible for his home.
C．Change the idea of getting married.
D．Made up his mind to be married.
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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.
单项选择题
A growing plant needs water for all of the following except ______.
A．forming simple sugars
B．keeping woody stems
C．keeping green
D．producing carbon dioxide
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