下列细胞结构中，只有植物细胞才具有的结构是[]A．细胞核B．细胞质C．细胞壁D．细胞膜-八年级生物

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• 每种植物细胞通常都具有一定的形态，这主要是因为[]A．细胞壁的保护作用B．细胞膜的保护作用C．细胞壁的支持作用D．细胞膜的支持作用-七年级生物
• 请将下面的结构与功能用线连接起来。①细胞核a．动力车间②线粒体b．遗传信息库③叶绿体c．控制物质进出④细胞膜d．缓慢流动，加速物质交换⑤细胞质e．使光能转变成化学能-七年级生物
• 阅读理解 Will the world end in 2012? Many people believe the Mayan Calendar 2012 says so. But there is s
• 阅读下面短文，根据所给语境，按要求完成下列各题。 The first walk into outer space was taken by a Soviet astronaut. Astronaut
• 完形填空。 Is food important for us? The answer is YES. If we do not eat 1, we will feel hungry. If we ca
• 阅读短文，用方框中所给词的正确形式填空。one, everyone, usual, for, hundred, fly, look, understand, study,be There is som
• 阅读理解。 Men sometimes say, "We are better and cleverer than women.Women never invent things, we d
• 任务型阅读. As an American, I was surprised to learn that Chinese students must be good at sports in orde
• Complete the following passage with the words or phrases in the box. Each can only be used once (将下
• 下面两张图分别是哪类生物的细胞图，请你仔细辨别并回答有关问题：⑴图A表示___________细胞结构图，图B表示_____________细胞结构图；⑵A和B的区别是B没有__________、__
• 完形填空 Many animals use some kinds of "languages". They use signals (信号) and the signalshave
• 下面有关细胞的知识叙述中，错误的是（）A．植物细胞有细胞壁和液泡，动物细胞没有B．人的红细胞放在清水中，会吸水过多而涨破；洋葱根尖细胞则不会C．烟草叶片细胞中的尼古丁和柿-生物
• 植物的根毛细胞既能吸收土壤中的氮、磷、钾等营养物质，又能将其它不需要的物质挡在外面，这主要是由于[]A．细胞壁具有保护细胞的功能B．细胞膜具有保护细胞的功能C．液泡与吸水-八年级生物
• 用连线表示出下列细胞结构与功能的对应关系A．细胞膜①含有遗传物质B．细胞质②将光能转变为化学能C．细胞壁③控制物质进出D．细胞核④进行生命活动场所E．叶绿体⑤支持、保护作用-七年级生物
• 植物细胞进行呼吸作用的主要场所是[]A．叶绿体B．细胞核C．线粒体D．细胞壁-七年级生物
• 阅读下面短文，根据短文内容回答问题。 Whatisthehottesttopicatyourschool?InHangzhouYongjinMiddleSchool,it'smoney.Th
• 阅读理解。 Unlike your heart and brain(脑子), your teeth weren’t there ready to work from the day you were
• 阅读理解 A long time ago people thought that the Sun went round the Earth. In some countries people even
• 阅读理解。 Some day you may go to the moon. A tall rocket will take you into space. The rocket flies a lo
• 阅读理解。 Do you know about Dolly, a famous sheep? She was created by cloning more than ten years ago in
• 阅读理解 Do you know how blueberries(蓝莓,越橘的一种)grow? They grow on bushes(灌木丛).Each blueberry is small and
• 阅读理解。 My hometown is Tianjin.It is one of the biggest cities in China. It is next to Beijing-the cap
• 下图是植物细胞和动物细胞的结构示意图，据图回答问题：（1）属于植物细胞的是__________图，你判断的依据是该细胞具有__________、_______和________；（写名称）图中B除了保
• 阅读理解 Some children wish to be writers some day. They want to write stories or books for people to re
• 任务型阅读 3.For those of us who are studying at school,the time of exams is very stressful and difficult
• 下列结构中，动植物细胞都具有的是（）①细胞壁②细胞膜③细胞质④细胞核⑤叶绿体⑥线粒体⑦液泡．A．①②③④⑥B．②③④⑥C．③④⑤⑥D．①⑤⑥⑦-生物
• 切开熟透的西瓜时，有浅红色的汁液流出来，这些汁液主要来自[]A．细胞壁B．细胞膜C．细胞核D．液泡-八年级生物
• 人们在切食成熟的西瓜时流出的汁液是[]A．细胞质B．液泡C．细胞核D．细胞液-七年级生物
• 阅读理解。 The best way of learning a language is using it. The best way of learning English is talking i
• 阅读理解。 During the day we work and play and at night we sleep. Our bodies rest while we sleep. In the
• 阅读理解。 There is a handsome boy. He has golden hair and a pair of big blue eyes. But he looks very sad
• 完形填空。Many people today like reading stories about UFOs. Many people in different countries are1 UFOs
• 阅读理解。 Do you believe there are aliens (外星人) ? Well, make a phone call and you will know. A group of
• 丽丽穿的白裤子被鲜菠菜汁染上绿色，能将这一污迹除去的最佳材料是[]A．普通洗衣粉B．酒精C．沸水D．肥皂水-八年级生物
• 完形填空。 On the first day of school, the new teacher had a look at the name list of students. How pleas
• 完形填空 Now satellites are1 to forecast (预报) the weather. They are in space, and they can2 any part of
• 请指出植物细胞结构简图中部分结构名称标号1是______，标号2是______，标号3是______，标号5是______．-生物
• 恩吉尔曼把载有水绵和好氧性细菌的临时装片放在无空气的黑暗环境里，用极细的光束照射水绵。显微观察发现，好氧性细菌只集中在叶绿体被光束照射到的部位附近；如将上述装片完-七年级生物
• 福桔的果肉酸甜可口，其酸甜的物质主要贮存在[]A．细胞壁B．液泡C．细胞核D．细胞膜-八年级生物
• 阅读理解。 Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freeze
• 阅读理解。 The dog of the future (未来) is here, and you don't need to feed it or walk it behind it. T
• 根据短文内容及所给首字母填写所缺单词 Many people find exams a frightening experience.Sitting down for an exam when eve
• 完形填空。 I am a student in Grade Three. I began to learn English the year before last. English isn'
• 阅读理解。 A prairie is a type of grassland. Prairies are made up of a complete interdependent ecosystem.
• 西瓜之所以甘甜可口，主要是因为西瓜的下列哪项含有大量的糖分[]A．细胞壁B．细胞膜C．细胞液D．细胞核-七年级生物
• 阅读理解 Many parents make their children do chores around the house. For some families, teaching childr
• 完形填空 The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952 ,on one smal
• 根据短文大意选择方框内的单词并用其正确形式填空，使补全后的短文意思通顺，语法正确，结构完整。walk, way, without, prevent, easy Trees are useful in
• 阅读理解 Scientists think that a weather pattern( 形式)calledE1 Nino( 厄尔尼诺现象)caused the drought( 干旱)in Au
• 要判断某一球形的多细胞生物是植物还是动物，下列哪种办法是可行的（）A．在显微镜下观察它的细胞是否有细胞壁B．给它提供适宜的环境，看它是否发生细胞分裂C．刺激它，看它是否能-生物