聪聪同学查阅资料获得有关物质燃烧的新信息: ⑴2Mg+CO22MgO+C ⑵H2+Cl22HCl 由此形成以下几点认识: ①反应⑴属于置换反应 ②施用二氧化碳灭火也应有所选择 ③燃烧不一定要有氧气参加,其中正确的是( ) A.只有①② B.只有①③ C.只有②③D.①②③ 答案:DThis is Ted’s photo. We miss him a lot. He ____ trying to save a child in the earth-quake. A. killed B. is killed C. was killed D. was killing