题干

 某初中化学社团﹣﹣“拉瓦锡实验室”的活动丰富多彩.下面是他们以“化学与社会发展”为主题的两次活动记录:

活动1:在观看了“西气东输”与“石油分馏”等视频后.通过小组讨论,同学们认识到:

①____、石油、天然气是人类社会重要的自然资源.天然气的主要成分是甲烷,甲烷完全燃烧的化学方程式是 ____ .

②现在化石燃料等不可再生能源面临枯竭,化石燃料对环境的影响也不容忽视.所以,开发和利用风能、____等新能源成为越来越迫切的要求.

③人们将化石燃料通过化学工艺可以制造和合成价值更高的药物、化学纤维、塑料和合成橡胶等.其中,塑料属于____材料.随意丢弃会造成“白色污染”.

活动2:同学们展示了各自收集到的关于“化学物质与健康”的相关资料及一些常见食品,如:高钙牛奶、加碘食盐等.并针对“化学制品对人体有益还是有害”展开了激烈的辩论,从而认识到钙、铁、锌等元素对人体健康有重要作用,如缺铁元素会引起缺铁性贫血,缺钙元素会引起____;还认识到一氧化碳、甲醛等物质对人体健康的危害.通过这样的社团活动,大家形成了“保护自然,关爱生命”的共识.

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\u7164,CH4+2O2\u200bCO2+2H2O,\u592a\u9633\u80fd,\u5408\u6210,\u9aa8\u8d28\u758f\u

同类题3


 Donna Ashlock, a 14-year-old girl from California, was very sick. She had a bad heart. “Donna needs a new heart,” her doctor said, “she must have a new heart, or she will die soon.”

 Felipe Carza, 15, was worried about Donna. Felipe was Donna’s friend. He liked Donna very much. He liked her freckles, and he liked her smile. Felipe didn't want Donna to die.

 Felipe talked to his mother about Donna. “I am going to die,” Felipe told his mother, “and I am going to give my heat to Donna.”

 Felipe's mother didn't pay much attention to Felipe. “Felipe is just kidding,”she thought, “Felipe is not going to die. He's strong and healthy.”

 But Felipe was not healthy. He had terrible headaches sometimes. “my head hurts,”he often told his friends. Felipe never told his parents about his headaches.

 One morning Felipe woke up with a sharp pain in his head. He was dizzy (眩晕的), and he couldn’t breathe. His parents rushed Felipe to the hospital. Doctors at the hospital had terrible news for them. “Felipe's brain is dead,”the doctors said, “we can't save him.”

 The parents were very sad. But they remembered Felipe's words. “Felipe wanted to give his heart to Donna,”they told the doctors.

 The doctors did several tests. Then they told the parents, “we can give Felipe's heart to Donna.”

 The doctors took out Felipe's heart and rushed the heart to Donna. Other doctors took out Donna’s heart and put Felipe's heart in her chest. In a short time the heart began to beat.

 The operation was a success. Felipe's heart was beating in Donna’s chest, but Donna didn't know it. Her parents and doctors didn't tell her. They waited until she was stronger; then they told her about Felipe. “I feel very sad,”Donna said, “but I am thankful to Felipe.”

 Three months later the operation Donna went back to school. She has to have regular checkups, and she has to take medicine every day. But she is living a normal life.

 Felipe's brother John says, “Every time we see Donna, we think of Felipe. She has Felipe's heart in her. That gives us great peace.”