下列细胞结构中，能够进行能量转换的是：[]A．线粒体与叶绿体B．细胞质与液泡C．细胞核与线粒体D．细胞壁与叶绿体-七年级生物

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• 制作洋葱表皮的临时装片的操作顺序是①把洋葱表皮置于载玻片中央的清水中②在载玻片中央滴一滴清水③用碘液染色④盖上盖玻片[]A．①②③④B．④①②③C．②①④③D．①③②④-七年级生物
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• 将甲、乙、丙三块等体积并去皮的萝卜条分别放入0.3%、11%和25%的蔗糖溶液中。甲变得硬挺，乙基本无变化，丙变小变软。这说明萝卜细胞液的浓度为[]A．低于0.3%B．约为0.3%C．-七年级生物
• 下列情况中，细胞能吸水膨胀的是[]A．糖拌西红柿B．萝卜条泡在浓盐水中C．盐拌黄瓜D．软缩的萝卜条泡在清水中-七年级生物
• 下列关于植物细胞结构和功能的叙述中，错误的是[]A．植物细胞是植物体结构和功能的基本单位B．植物细胞具有细胞壁、细胞膜、细胞质和细胞核等结构C．成熟的植物叶肉细胞具有叶绿-七年级生物
• 市场上买菜的人常常给蔬菜喷水，这样做的道理是使蔬菜[]A．细胞吸水，保持硬挺B．细胞失水，保持硬挺C．细胞吸水，保持柔软D．细胞失水，保持柔软-七年级生物
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• 人们在切西瓜时，流出的汁液来自细胞的[]A．细胞膜B．细胞质C．液泡D．细胞核-七年级生物
• 阅读理解。 Most people have a cellphone (手机). When you are walking on a busy street, you will see many pe
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• 在植物细胞中能够把光能转变为有机物的能量，并称为能量转换器的结构是[]A．细胞壁B．细胞核C．叶绿体D．细胞质-七年级生物
• 高倍镜视野内观察到的细胞具有细胞壁、细胞核和大液泡，这种细胞最可能：[]A．动物细胞B．植物细胞C．细菌D．病毒-七年级生物
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• 植物细胞周围水溶液浓度大于植物细胞液的浓度时[]A．水由细胞外的水溶液向细胞内渗透B．水由细胞内向细胞外渗透C．细胞吸水D．细胞液中的水分增加-七年级生物
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• Reading comprehension. Fruit and vegetables should be a part of what we eat every day. Educating you
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