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木质部导管从功能上来说比管胞进化。 A. 对 B. 错

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Weather changes when the temperature and the amount of water in the atmosphere change. We can see and feel water coming from the atmosphere when we have rain. But the water must somehow get back to the atmosphere. Meteorologists call this the water cycle. A. Water cycle. B. Water vapour. C. How rain forms. D. Water, vapour, rain.