题目

Mary is afraid to speak in front of the class because of her (shy). 答案：【1】shyness13、以下说法错误的是（　　）A、浸没在植物油中的铁钉不易生锈B、金属单质都能跟酸起置换反应放出氢气C、硝酸钾（KNO3）是复合肥D、酸和碱反应生成盐和水是复分解反应，又叫中和反应