制作洋葱表皮细胞临时装片的正确顺序是[]A．撕取内表皮、滴清水、染色、盖盖玻片B．撕取内表皮、滴清水、放置材料、盖盖玻片、染色C．滴清水、撕取内表皮、放置材料、染色、盖盖-七年级生物

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• 植物细胞既可以________，也可以________，这主要取决于细胞________水溶液的浓度和________浓度的大小。当周围水溶液的浓度________细胞液浓度时，细胞就失水；当细胞液浓
• 用盐拌黄瓜，黄瓜会出现________现象，若把已经________的黄瓜再放入清水中，则黄瓜又________，前者说明植物细胞可以________，后者说明植物细胞可以________。-七年级生
• 阅读理解。Here's the content (目录) of a book. 1. If you're interested in music, you can read &qu
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• 缺词填空。 Maybe you are more interested in sports than in history. You probably think you will never be
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• 将菠菜泡在开水中，开水会变绿，而把菠菜泡在冷水中，水不会变绿，这是因为开水破坏了细胞的[]A．细胞壁B．细胞膜C．细胞质D．细胞核-八年级生物
• 紫菜的叶绿体中，除含有叶绿素外，还含有大量的[]A．胡萝卜素B．叶黄素C．藻红素D．藻黄素-八年级生物
• 阅读理解。 Mails, games, music, news, chat rooms and shopping! The Interent is part of our life today. It
• 完形填空。 Like the body, the memory improves with use.1 the body, the memory can improve with age.For ma
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• 阅读下面的短文，将划线部分的句子译成汉语。 1 Dreams may be more important than sleep. Some people don't need very mu
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• A．细胞壁①控制物质进出B．细胞膜②遗传的控制中心C．液泡③支持保护作用D．细胞核④光合作用场所E．叶绿体⑤内含细胞液-八年级生物
• 下图是菠菜叶肉细胞的模式图。当我们研磨菠菜叶时，会发现有许多绿色的汁液流出。这些汁液主要来自图中的[]A．1B．3C．5D．6-八年级生物
• 探究与实践题某同学在做西红柿果肉细胞临时装片时，他发现以下问题，请你帮助他分析、解决一下。(1)在观察的过程中，视野忽明忽暗。________________________(2)他挑取了少量-七年级
• 缺词填空。所填单词在题后横线上必须完整写出。 Mr. Louis B. Russell (1)l______ in Indianapolis, a city in the state of India
• 细胞是生物体结构和功能的基本单位，是一个植物细胞模式图。请据图回答以下问题：（1）细胞中的遗传信息库是__________。（2）能够控制物质进出细胞的结构是_________。（3）植物进-七年级生
• 阅读理解。 We often see planes speed up on the runway and take off at the airport. Can this happen on the
• 阅读下面短文，根据上下文和所给单词首字母，写出标有题号的每小题空白处适当单词的完全正确形式。 Class 5 was the worst class in Hill Valley Hight Sch
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• 细胞质中与光合作用有关的是[]A．叶绿体B．液泡C．线粒体D．细胞液-七年级生物
• 先阅读短文，掌握其大意，然后从方框中所给的词中选出最恰当的10个，并用其适当形式填空，每个次限用一次。leafthen large learn ones grow thick hasmeanfirst
• 用方框中所给词语的适当形式填空，每词限用一次。(每词限用一次)。good, appear, interest, much, live in, write down, feed, ask, wide,
• 用所给词的适当形式填空。（必要时可加助动词或情态动词。） It's sometimes 1______ (report) that strange objects 2______ (see
• 用方框中所给词语的适当形式填空，每词限用一次。 grammar, suggestion, good, boring, improve, ask, differently, however, chat
• 阅读下面短文，从所给的12个词或词组中选出10个词或词组，并用其适当的形式填空。listen to, ask for, hear, think, learn, say, important, good
• 制作洋葱鳞片叶表皮细胞的临时装片时，染色的正确方法是[]A．先将碘液滴在载玻片中央，再将洋葱表皮放入并展平B．先盖盖玻片，再将碘液滴在盖玻片一侧，另一侧用吸水纸吸C．将洋-七年级生物
• 在显微镜下观察用碘液染色的洋葱表皮细胞时，细胞染色最深的结构是[]A．细胞壁B．细胞膜C．细胞核D．细胞质-七年级生物
• 叶绿体能够把[]A．热能转变成化学能B．光能转变成化学能C．化学能释放出来D．光能释放出来-七年级生物
• 将下面植物细胞的结构与相适应的功能用直线连接起来。①细胞壁A．保护细胞内部结构和维持细胞形态②细胞质B．控制细胞内外物质的进出③线粒体C．进行生命活动的重要场所④细胞膜D．能-七年级生物
• 阅读理解。 The kids at the top of the class get there by mastering (掌握) a few good ways that others can l
• 植物体内长成的细胞中，细胞里有[]A．一个大液泡B．许多大液泡C．一个小液泡D．许多小液泡-七年级生物
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• 下图是植物细胞与动物细胞示意图，请据图作答：（1）植物细胞示意图是_____图，你的判断依据是该细胞有___________。（任写一项）（2）图中②④⑥是动植物细胞都有的结构，其中④的名称-七年级生
• 将名词与相应的功能对应起来。1．循环系统a．保护内部柔嫩部分2．细胞膜b．使光能变成化学能3．叶绿体c．控制物质进出4．上皮组织d．运输体内物质5．分生组织e．运输水和无机盐6．输导组-七年级生物
• 阅读下面的短文, 完成下面的任务。 A new study finds people in big cities walking faster than before. Is the pace (节奏
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• 阅读理解。 "How can I learn English well?" This is a question many students ask. In my opinion,
• 在普通光学显微镜下不易看清植物细胞的[]A．叶绿体B．细胞膜C．细胞壁D．细胞核-七年级生物
• 观察洋葱表皮细胞结构的实验步骤是[]A．制作标本、染色、画图、观察B．制作标本、观察、染色、画图C．染色、制作标本、观察、画图D．制作标本、染色、观察、画图-七年级生物
• 番茄中带有酸味的物质存在于[]A．细胞核B．细胞质C．液泡D．细胞壁-七年级生物