青蛙不能成为真正陆生动物的原因是A．体温不恒定B．生殖离不开水C．皮肤辅助呼吸D．变态发育-八年级生物

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• 下图分别表示青蛙发育过程中的四个阶段（）①②③④A．①②③④B．②③④①C．②③①④D．④②①③-八年级生物
• They will do all they can _____ the game. [ ]A. to compete inB. compete in C. to compete D. in compe
• 短文改错。假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的一篇作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：-高一英语
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• 大鲵是世界上现存个体最大的两栖动物，由此可知大鲵的生殖和发育方式是（）A．卵生、体外受精、变态发育B．卵生、体内受精、变态发育C．卵生、有性生殖、无变态发育D．胎生、有性生-八年级生物
• 青蛙的生殖与发育过程在中进行，要经历受精卵、、幼蛙、成蛙四个时期．-八年级生物
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• 下列对青蛙生活习性和生殖发育特点的描述中，不正确的是A．雄蛙和雌蛙的抱对有利于提高卵的受精率B．雄蛙的鸣叫是一种求偶行为C．青蛙既能生活在水中，又能生活在陆地上，所以它-八年级生物
• 两栖动物的生殖和幼体发育必须在中进行，幼体要经过发育才能上陆生活。-九年级生物
• 短文改错。此题要求改正所给短文中的错误。如无错误，在该行右边横线上画一个对号； 如多词，则用（ \ ）划掉；如缺词，则在此处加一个（^），并把正确的写在 横线上；如错一词，-高一英语
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• 你见过青蛙吗?青蛙的发育过程包括四个阶段，顺序是①受精卵②成蛙③蝌蚪④幼蛙A．①④③②B．①③④②C．①②③④D．①③②④-八年级生物
• Would you please tell me the quickest way ______ English well? [ ]A. to learn B. of learningC. how t
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• 下列动物中，在其一生中的不同阶段具有不同的呼吸器官的是（）。A．哺乳动物B．两栖类C．鱼类D．鸟类-八年级生物
• “黄梅时节家家雨，青草池塘处处蛙”，蛙的生殖与发育过程中，不会发生的是A．雄蛙呜叫B．雌雄抱对C．育雏行为D．变态发育-八年级生物
• _____this term, we will have learned more than 2,000 words. [ ]A. At the end B. At the end of C. By
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• 下图所示为青蛙的发育过程，回答下列问题⑴青蛙一般生活在_________的环境中，它的体色大多是_________。⑵青蛙的发育起点是［］_________，经过_________阶段最后发育成___
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• 表1是某校生物课外科技小组人工孵化蛙卵的实验方案记录表（用同样大小的容器，装等量的水，孵化时间相同）。请回答：表1人工孵化蛙卵的实验记录项目组别水源水量/mL水温/℃蛙卵数-八年级生物
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• 下列对青蛙生殖发育特点的描述中，最恰当的是A．雌雄异体，体外受精，水中发育B．雌雄同体，体内受精，体内发育C．雌雄异体，体内受精，水中发育D．雌雄同体，体外受精，体外发育-八年级生物
• 青蛙个体发育的起点是A．雌蛙体内成熟的卵细胞B．受精卵C．刚孵出的小蝌蚪D．刚由蝌蚪发育成的小青蛙-八年级生物