题目

________ much advice I gave him, he did exactly what he wanted to do. A . Whatever B . Whenever C . However D . Wherever 答案：C 下列物质的用途，主要利用了物质的化学性质的是（    ）  A．氧气用于急救病人         B．“干冰”用于人工降雨  C．生铁铸造铁锅             D．铜用于制造导线