在显微镜下观察下列哪一种材料时，能在细胞内找到上图中④所示结构？[]A．洋葱鳞片叶内表皮B．人的口腔上皮C．黄瓜表层果肉D．洋葱根尖-七年级生物

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• 阅读下面的短文，根据短文内容，完成短文后的填写表格任务。 Here are some suggestions on listening. We hope they can help you in on
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• 叶绿体能够利用____把水和____等合成有机物，有机物及其储存的____可以供给________利用，也可以直接或间接地供给____利用。-七年级生物
• 根据植物结构示意图，回答下列问题。(1)具有保护和支持细胞功能的是[]__________。(2)犹如细胞门户，凡是进出细胞的物质都要由此结构选择的是[]__________。(3)烟叶中的烟碱-七年
• 切割西瓜时，流出的汁液是____，它贮藏在细胞质中的__________中，在植物绿色部分的细胞中，细胞质内还有__________。-七年级生物
• 阅读理解。 A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you
• 阅读理解。 The class in America is almost the same as that in China. But something is different.(1) In Am
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• 任务型阅读。 New rules and behavior standards (规范) for middle school students came out in March. Who are t
• 根据下图回答问题：(1)已知有一台显微镜，其目镜上标有10×，物镜上标有40×，则这台显微镜可以把物体放大_______倍。(2)使用显微镜观察玻片标本的正确步骤是__________。①收放-七年级
• 据细胞结构图回答问题：（1）下图中属于植物细胞结构的是_______图，属于动物细胞的是______图。从图中可以看出，植物细胞与动物细胞共同具有的结构是_____________。（2）其中能-七年
• 阅读理解。 It's 2009. You feel sick, so you go to the doctor. She checks your fever, looks at your t
• 根据短文内容判断正误。正确的在括号中写“T”，错误的写“F”。 Robots seem very new to most people. But they have a long history. T
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• 吸烟有害健康，原因是烟草含有对人体有害的物质(尼古丁)，这种物质主要存在于烟草细胞中的[]A．细胞壁上B．液泡中C．细胞核内D．细胞质中-八年级生物
• 阅读理解。 Do you know kind words and light music (轻音乐) have something to do with plants?Many people talk
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• 植物体上的绿叶，嫩茎等部分的细胞中的细胞质里含有一些绿色小颗粒叫__________，__________内含有__________等色素。-七年级生物
• 小刚同学在显微镜下观察到一些细胞，他判断是植物细胞。因为他观察到了[]A．细胞壁和液泡B．细胞壁和细胞膜C．细胞质和细胞核D．细胞膜和细胞质-八年级生物
• 阅读理解。 Not long ago, Richard Denniston found himself suffering the same pain that millions of other p
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• 阅读理解。 This is the times of information technology. Pakistan (巴基斯坦) is also trying to keep up with th
• 制作洋葱表皮临时装片时，下面操作正确的是[]A．用餐巾纸擦拭载玻片B．将洋葱块直接放置在显微镜下观察C．用镊子将取下的洋葱表皮在水滴中展平D．染色时掀开盖玻片，滴入染液-七年级生物
• 阅读下面短文，根据短文内容完成下面表格。 Dreams may be more important than sleep. Some people don't need much slee
• 完形填空。 Many people say that they have seen flying saucers (飞碟) in the sky.1 can these things be?Some
• 阅读理解。 Radio, telephone and television are widely used in the world. When you witch on the radio, you
• 在制作洋葱表皮细胞临时装片时，正确的做法是[]A．尽量将材料撕得薄B．将盖玻片垂直于载玻片后迅速放下C．如有气泡，则用手轻压赶出D．盖上盖玻片后，可直接将稀碘液滴在盖玻片上-七年级生物
• 植物细胞中，具有控制物质进出作用的结构是[]A．细胞壁B．细胞膜C．细胞质D．细胞核-七年级生物
• 在光学显微镜下观察植物细胞，不能看到的细胞结构是[]A．细胞壁B．细胞膜C．细胞质D．液泡-七年级生物
• 阅读理解。 As any homemaker who has tried to keep order at the dinner table knows, there is far more to a
• 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
• 菠菜放在开水里煮过后水的颜色变绿，而放在冷水中则不产生这种现象，原因是[]A．煮过后，绿色从细胞壁上褪了下来B．叶绿素溶解于热水而不溶解于冷水C．细胞质受热后产生绿色D．细-七年级生物
• 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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• 阅读理解。 New rules and behavior standards (行为规范) for middle school students came out (颁布) in March. Mid
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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
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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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