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1、对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于
2、闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have雌 雄
3、蛙 抱 对雄 蛙 鸣 叫蛙的卵块对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain cond
4、ition, we have思考:青蛙 受精卵的颜 色上面较深 有什么意义?能够吸收较多的热量,有利于受精卵的发育。对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix
5、, prove that when satisfy the certain condition, we have青蛙的抱对青蛙的抱对抱对有利于精 液直接排 在卵上, 这样就会 提高卵的 受精率。 对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary oper
6、ation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have 1、阅读课本第47页“两栖动物的生殖”部分 (2 分钟),回答下列问题: (1)每年的 是青蛙的繁殖季节,雄蛙发出鸣 声,以吸引 。(2) 雄蛙和雌蛙经 ,分别把精子和卵细胞排放到 中,精子和卵细胞在 结合成 (3)由(2)可知 ,青蛙的生殖特点是 受精 (体内受精还是体外受精)。生殖方式是 _。 (4)青蛙鸣叫、包对的意义是 、 。对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是
7、如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have受精卵蝌蚪先长后腿后长前腿尾巴逐渐消失成蛙对于闪光灯,很多人是恐惧的。同时
8、驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have 2、阅读课本第48页“两栖动物的发
9、育”部分 (5分钟),回答下列问题,把不明白的问题标记 下来,小组共同讨论解决。 (1)观察课本48页图4.2-9,分析青蛙的发育过程: 受精卵 幼蛙 ()两栖动物就是幼体生活在 ,用 呼 吸;成体生活在 ,也可以生活在 上,主要用 呼吸,同时兼用 辅助 呼吸。因此青蛙的发育是 发育。 ()青蛙的生殖和发育都离不开 ,所以保护青 蛙 ,首先要保护它们的 。 ()常见的两栖动物有 、 、 等, 它们生殖和发育的共同特征是 、 。对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequal
10、ity into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequalit
11、y into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality
12、into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality in
13、to equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into
14、 equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have (二)学习研讨:小组成员相互讨论,交流,共同研讨 ,回答下列问题, (时间:5分钟) 1、观察课本48页图4.2-9,分析讨论青蛙的发育过程 : 问题(一)在蝌蚪发育成青蛙的过程中,形态上
15、 发生了那些主要变化? 问题(二)在外部形态上,蝌蚪和青蛙有哪些特点与其 生活环境相适应? 2.什么叫两栖动物? 3. 两栖动物是脊椎动物中种类数量较少、分布狭窄的 一个动物类群,为什么? 4、青蛙是水陆两栖的动物,你知道他的哪些行为必 须在水中进行吗? 5、青蛙是人类的朋友,对于保护青蛙你有哪些好的 建议?6.自己动脑设计一句保护青蛙的广告语: _对于闪光灯,很多人是恐惧的。同时驾驭两三灯,甚至五灯,的确是很难。但是如果仅仅只是一灯的话,问题就简单很多。更何况即便是,一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when sa