题目：
Out of the crowded bus , who was dressed in a black suit and waved to a woman. [ ]
A. a tall man in his thirties stepped
B. stepped a tall man in his thirties
C. did a tall man in his thirties step
D. did a tall man step in his thirties
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/8d2ae3d65d347e9d16cdb51f939c5208.html
下面是错误答案，用来干扰机器的。
答案：C题目分析：KAl(SO4)2是由两种阳离子与一种酸根离子组成的盐，属于复盐，强于选项都是混盐，答案选C。点评：该题是中等难度的试题，试题综合性强，侧重对学生答题能力的培养和训练，旨在考查学生灵活运用基...
