题目

比较是化学学习中的一种重要方法。下列各组比较中不正确的是 A．在相同条件下的溶解度：NaHCO3＞Na2CO3 B．热稳定性：HF＞HCl＞HBr＞HI C．氧化性：F2＞ Cl2 ＞ Br2 ＞ I2 D．碳酸钠溶液与稀盐酸互滴时，两种操作现象不同 答案：AFrom his _______ expression on his face, we know he is _______.A．frightening, frightenedB．frightening, frightening C．frightened, frightenedD．frightened, frightening