给植物施用钾肥，含钾的无机盐能进入细胞，主要受下列哪一结构控制[]A．细胞壁B．细胞核C．细胞膜D．细胞质-七年级生物

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• 显微镜是生物实验中最常用的观察细胞的仪器，请回答下列有关实验的问题：(1)在观察洋葱鳞片叶的表皮细胞时，怎样区别显微镜视野中的气泡和细胞？_____________。(2)如果在视野-七年级生物
• 下面哪一组结构是植物细胞特有的[]A．细胞壁、细胞核B．细胞膜、叶绿体C．细胞膜、液泡D．细胞壁、叶绿体-七年级生物
• 用糖拌西红柿，一段时间后，盘中会出现一些液体，主要原因是西红柿细胞的细胞液浓度[]A．大于外界溶液浓度，细胞吸水B．小于外界溶液浓度，细胞吸水C．大于外界溶液浓度，细胞失-八年级生物
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• 将名词与相应的功能对应起来。1．细胞膜a．内有细胞液2．叶绿体b．控制物质进出3．分生组织c．运输水和无机盐4．输导组织d．分裂能力5．细胞核e．保护和支持细胞6．细胞壁f．遗传信息库7-七年级生物
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• 水稻叶肉细胞中的能量转换器的[]A．线粒体B．叶绿体C．线粒体和叶绿体D．液泡-八年级生物
• 完形填空。 How can you think in English? I think the best way is to practise as what a football player 1
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• 细胞是物质、能量和信息的统一体，细胞的生活需要物质和能量。_____________能够将光能转变成化学能，___________能将有机物中的化学能释放出来，为细胞的生活提供动力，细胞-七年级生物
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• 绿色植物进行光合作用的主要场所是[]A．叶绿体B．细胞核C．细胞膜D．液泡-七年级生物
• 下面是明明制作洋葱鳞片叶表皮细胞临时装片的操作步骤，操作顺序正确的是[]A．①②③④B．①③②④C．②①③④D．②①④③-八年级生物
• 综合填空。 There are four seasons in a year: spring, summer, fall and winter. In spring, the weather is w
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• 阅读理解。 Let me tell you my first English class. It's very interesting. It's the first class
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