Tom shut everybody out of the study ___ he could prepare for the coming exam. A．which B．when C．so th

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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
• 下列动物生殖过程中属于体外受精的是[]A．青蛙B．蝗虫C．家鸽D．蜜蜂-八年级生物
• 刚从受精卵中孵化出来的小蝌蚪在形态结构上和成年蛙有很大的区别，下列各项有关早期蝌蚪特点的描述中，哪一项是错误的？[]A．小蝌蚪长得很像小鱼B．小蝌蚪在水中用鳃来呼吸C．小-八年级生物
• 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
• 下列有关两栖动物的描述中，错误的是[]A．既能生活在水中，又能生活在陆地的动物是两栖动物B．两栖动物是变态发育，幼体呈蝌蚪形，成体具有四肢C．两栖动物的心脏为二心房一心室-八年级生物