题目

Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.   A. as if                B. now that                 C. even though           D. so that   答案：C下列做法错误的是A. 倡导“低碳”生活，多乘公共交通工具 B. 限制、禁止燃放烟花爆竹C. 为了保护环境，分类回收废旧电池 D. 为使粮食增产，大量使用农药化肥