—The books on the chair ______ Millie's, right?— Yes, they are. [ ]A. is B. they're C. it&

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• 右图为生态系统组成成分，据图写出1--4的名称：[1]是______，[2]和[3]是______，[4]是______．-生物
• 如图是某草原生态系统的食物网图解，请据图回答．（1）该食物网中共有______条食物链．请写出其中最短的一条食物链______．（2）食草昆虫和鼠的关系是______．青蛙、蜘蛛、蛇等生物进-生物
• The piece of music ______The piece of music ______really beautiful.[ ]A. looks B. hears C. sounds D.
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