题目

 It’s careless _____ him to make the same mistake again. I think it important ______ everyone to be careful in everything.       A. to; for    B. for; of      C. of; to       D. of; for 答案：D 下列变化中，属于化学变化的是（　　） 　 A． 汽油挥发 B． 石蜡熔化 C． 矿石粉碎 D． 煤燃烧