My English teacher has given me so much help that I really want to do something for him _____. [ ]A.

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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
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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
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• “鸡生蛋，蛋生鸡。先有鸡还是先有蛋？”这个古老的问题难住了许多科学家。下列动物不是产卵繁殖，而是胎生动物的是A．丹顶鹤B．蝗虫C．蝮蛇D．梅花鹿-八年级生物
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• 下列有关生物的生殖和发育的说法中，正确的是A．细菌通过芽孢繁殖B．植物组织培养和试管婴儿技术都属于无性繁殖C．鸡卵的卵黄表面有一盘状小白点，是胚盘，里面含有细胞核D．人的-九年级生物
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• He the company for five years. [ ]A.is in charge of B. is in the charge ofC. has been in charge ofD.
• finishing his homework, he went to play basketball. [ ]A. In B. Upon C. At D. With -高一英语
• 青蛙的生殖和发育与鱼类相似，表现在（）A．体内受精，水中发育B．体内受精，土中发育C．体外受精，水中发育D．体外受精，土中发育-八年级生物