You _______move to the next room. You may still stay here if you like.A. must B. needn’t C. can’t -

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• 如图表示其生态系统中物质循环的过程．请分析回答：（1）图中生态系统的生产者是______、分解者是______（用图中代码表示）．（2）图中①、③分别表示的生理过程是______、______；（提示
• 在食物链“水草→虾→鱼→鱼鹰”中，哪一环节含有的能量最多（）A．水草B．虾C．鱼D．鱼鹰-生物
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