题目

41. Thomas Edison had 2000 i               in his life. 42. He has many                 (亲戚) in that city, so he chose to work there. 43. She was t            , because she really wanted to get married. 44. The UFO that the young man d             yesterday was not true. 45. I r          I had made a bad mistake in the English exam. 下列归纳和总结完全正确的一组是 A．对现象的认识 B．化学与安全 ①打开盛有浓盐酸的瓶盖，瓶口出现白烟 ②铁丝在空气里燃烧，火星四射 ③碳酸钠溶液里滴加酚酞，溶液变成红色 ①稀酸溅入眼睛——用大量水冲洗 ②进入地窖——先做灯火实验 ③稀释浓硫酸——先放水，再放浓硫酸 C．对除杂和鉴别的认识 D．对概念的理解 ①用稀盐酸除去氧化钙中含有的少量碳酸钙 ②用熟石灰鉴别硫酸铵和硫酸钾固体 ③用肥皂水鉴别硬水和软水 ①能改变反应速率的物质，不一定是催化剂 ②只有单质和化合物生成的反应一定是置换反应 ③含碳元素的化合物一定是有机物