题目

下列食品添加剂与类别对应不正确的是（    ）A．调味剂——亚硝酸钠                      B．防腐剂——苯甲酸钠     C．疏松剂——碳酸氢钠                      D．着色剂——叶绿素  答案：A解析:略  The first thing ____ you should do is to learn all the new words by heart.     A. what               B. that               C. which            D. who