All the students were studying in classTom;he was playing football on the playground.A．exceptB．besid

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• 两栖动物的和幼体必须在水中进行，有时要经过变态发育才能上陆地生活。-八年级生物
• 青蛙的个体发育过程经历了[]A．卵→胚胎→幼蛙→成蛙B．卵→胚胎→蝌蚪→成蛙C．受精卵→蝌蚪→成蛙D．受精卵→蝌蚪→幼蛙→成蛙-八年级生物
• 青蛙抱对，进行的是体内受精。[]-八年级生物
• 青蛙的生殖特点是[]A．体外受精体外发育B．体外受精体内发育C．体内受精体外发育D．体内受精体内发育-八年级生物
• 某生物学习小组开展“环境水质对青蛙受卵孵化的影响”的探究活动：制作2组生态瓶并编号，A组各加入200mL的清水，B组各加入200mL不同浓度的污水；然后各放入100粒青蛙卵到瓶中，-八年级生物
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• 请分析回答下列有关青蛙生殖发育及结构功能的问题：（1）在宋朝诗人赵师秀的“黄梅时节家家雨，青草池塘处处蛙”诗句中，“雨”和“蛙”的内在联系有：A青蛙的受精方式为_________，发-七年级生物
• 青蛙的生殖方式是____________生殖，发育过程经历了受精卵、蝌蚪、幼蛙和成蛙四个时期，这种发育称为_________发育。-八年级生物
• 下图是青蛙发育过程中某些阶段的示意图，据图回答下列问题：(1)青蛙发育过程的顺序是__________。(2)图中的B用_______(填“外鳃”或“肺”)呼吸。(3)青蛙的生殖和发育在水中进行，-八
• 两栖动物：幼体必须生活在_________中，成体是既能在____________中生活，又能在_________上生活的动物。-八年级生物
• 两栖动物发展的繁盛时期是年间，当时气______、、。两栖动物走向衰退的时期是年至今，其原因是部分地区出现了_____和__，气候也变得_____。-八年级生物
• 青蛙受精卵的形成是在[]A．卵巢B．输卵管C．体外环境D．泄殖腔-八年级生物
• 下列关于两栖动物的说法错误的是[]A．鳄鱼、大鲵、蝾螈都是两栖动物B．如今两栖动物分布范围小，是因为它们的生殖离不开水C．两栖动物是一类由水生过渡到陆生的脊椎动物D．两栖动-八年级生物
• 雌蛙与雄蛙之间抱对的意义是[]A．捉住雌蛙，防止雌蛙逃走B．培养感情，建立起相对稳定的配偶关系C．雌蛙与雄蛙之间的识别D．雌蛙和雄蛙同时排出卵细胞和精子，提高卵细胞的受精率-八年级生物
• 青蛙从蝌蚪到发育成成蛙的过程中，不可能出现的变化是[]A．尾消失B．体表出现鳞片C．长出四肢D．鳃消失-七年级生物
• 从蝌蚪到青蛙，其主要呼吸器官的变化是[]A．内鳃→肺B．外鳃→内鳃→肺C．外鳃→肺D．内鳃→外鳃→肺-八年级生物
• 两栖动物不能完全适于陆地生活，主要原因是[]A．两栖动物的体温不恒定B．两栖动物的生殖发育离不开水C．两栖动物的心室中有混合血D．两栖动物的肺发育不善-八年级生物
• 小麦、青蛙和人的个体发育的起点都是[]A．卵细胞成熟时B．精子成熟时C．受精卵形成时D．种子或刚孵出小蝌蚪时-八年级生物
• 蝌蚪发育成成蛙的过程中，在形态上最后出现的变化是[]A．长出前肢B．长出后肢C．尾消失D．鳃消失-八年级生物
• 某兴趣小组就“不同水质对蛙卵孵化的影响”进行了探究，其实验记录如下表你认为该实验设计的不妥之处是[]A．不符合单一变量原则B．水量过多C．水温太高D．水中没有水草-八年级生物
• 两栖动物最繁盛的时期是3.45~2.25亿年前，请推测当时的环境条件可能是__________。-八年级生物
• 下图为青蛙发育过程的四个阶段：(1)青蛙的生殖和发育都必须在________中进行。(2)青蛙的发育顺序是________________(用序号表示)。(3)青蛙处于①阶段时，用________呼吸
• 体外受精：如蛙的受精卵在_________中形成。-八年级生物