题型:填空题 下列有关实验现象描述正确的是( )A.铁丝在空气中燃烧,火星四射,放出热量B.红磷在空气中燃烧,产生大量白色烟雾C.氢气住氧气中燃烧,发出淡蓝色火焰D.在吹灭蜡烛的瞬间,可以看到一缕黑烟 查看答案
题型:填空题 Mr. Alexander doesn’t just write for fun; _______, writing is his bread and butter. A.at lastB.in factC.in a wordD.as a result 查看答案