题目

下列各组中化合物的性质比较，不正确的是 A．酸性：HClO4＞HBrO4＞HIO4                B．碱性：NaOH＞Mg(OH)2＞Al(OH)3 C．稳定性：PH3＞H2S＞ HCl                   D．非金属性：F＞O＞S 答案：C听下面一段材料，回答第1-3题。1. What is the relationship between the speakers?A. Schoolmates.         B. Workmates.       C. Teacher and student.2. What might NOT the club teach?A. Take photos.          B. Develop films.      C. Repair cameras.3. What day is it today most probably?A. Monday.             B. Tuesday.          C. Thursday.