题目

养金鱼的鱼缸如果不经常换水，鱼就会出现“浮头”现象，甚至死亡，其主要原因是A．水中缺少氧B．水质容易变坏C．水中微生物过多D．水中缺少食物 答案：A解析:略 Would you like      soccer with us ?Sure. I like      soccer very much.        A. to play, playing   B. playing, play   C. to play, play   D. playing, playing