.Generally speaking, clothing made of man-made is less superior than_____made of natural fibers like

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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
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• 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
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