初中语文(人教版)七年级下册第一单元:思维导图及教材练习答案 4
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返回到目录 思维指导 第一节 细胞通过分裂产生新细胞 教材知识全解 知识点一 细胞的生长 1.概念 构成生物体的细胞要不断从周围环境中吸收营养物质,并且转变成组成自身的物质,体积会由小变大,这就是细胞的生长。 2.细胞不能无限生长 细胞在生长过程中,细胞的表面积与体积的比越来越小,通过细胞膜吸收的营养物质渐渐满足不了细胞对营养物质的需求,因此,细胞不能无限制地长大,一部分细胞长到...
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点击回到目录 An Air Crash 飞机失事 I was a previous typist in a post office. Because I couldn’t tolerate typing any more postage bills or postcodes on a typewriter every day, I resigned. With a greedy motivatio...
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点击回到目录 Study in America 留学美国 Nannan’s father runs an enterprise near the Ming Tombs selling batteries and drills to the Daqing Oilfield. Hoping to get the qualification to help govern it, Nannan made ...
点击回到目录 A Brave Maid 勇敢的女仆 A wooden vase from the Ming Dynasty at the entrance of the reception hall amazed everyone. The artists designed it in a rare style and selected valuable jewels to decorate it...
点击回到目录 Computers 电脑 The goal of early calculating machines was to simplify difficult sums. But with the help of new technology, electronic chips replaced tubes and a revolution of artificial intellige...
小学生奥数学习资料大全目录
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点击回到目录 Balanced Diet 平衡膳食 Wang Peng earned his living by running a barbecue restaurant, which served delicious bacon, fried chicken breast and mutton roasted with pepper and garlic. But his food and d...
点击回到目录 Abstract Art 抽象艺术 Abstract art used to be controversial. On one hand, the artists stopped painting delicate figures but attempted to adopt special techniques to give people different visual imp...
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返回到目录 【思维导图】 【教材练习答案解析】 返回到目录
小学生奥数学习资料大全目录 1年级奥数视频+课件+讲义 跳至底部下载链接 小学1年级奥数课件 01、图形的折叠 02、看图学数学 03、统计初步 04、趣题巧解 05、有趣的平面图形 06、有趣的立体图形 07、方向与位置 08、找规律填数 09、火柴棒的游戏 10、排队的学问 11、思维游戏 12、巧填算符 13、图形的剪拼 14、巧移物体 15、简单排列 16、单数与双数 17、数字迷游戏 1...
点击回到目录 Let’s Help Adolescents 帮助青少年 Whether they are male or female, adolescents feel like deciding on everything themselves in spite of parents’ instruction, especially when they face problems like s...
点击回到目录 Chaplin - A Great Master of Humour 幽默大师卓别林 Chaplin was an extraordinary performer who starred in and directed many outstanding comedies. Few were bored watching his moustache, his gestures or h...
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点击回到目录 A New Farming Way 新的耕种方式 Tuan was a farmer in Vietnam. For decades, he had been struggling to rid his family of hunger. However, it always confused him how to expand the output of his crops. Th...
点击回到目录 Sailing Home 划船回家 This novel was about an unbelievable but genuine adventure. Its author was a black businessman who was brought up in America. In 1956, he visited Africa, his birthplace. One d...
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点击回到目录 Sightseeing in the United Kingdom 观光联合王国 After the wedding, my cousin and his wife went to the United Kingdom for nationwide sightseeing. He faxed a letter to me in English yesterday. To my del...
点击回到目录 Immigrate to America 移民美国 Attracted by the boom in America, my nephew teamed up with a Korean to illegally cross the Bearing Strait in the Arctic to America. To avoid the Customs’ punishment, t...
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