题目

People who like travelling have their reasons.They believe that travelling can help them expand their field of view，especially in the geographical and historical sense.They also think that touring will give them more chances to enjoy different kinds of food and experience new things  that would never be  brought by other activities.But those who dislike travelling also have some reasons. Travelling，in my opinion，does more good than  harm.Most importantly，it broadens (使扩大) our mind.We can get in touch with other civilizations (文明)，cultures，customs and ideas. Th下列各组离子在选项条件下一定能大量共存的是A. 无色溶液：Na+、Fe2+、Cl-、 SO42-B. 酸性溶液：NH4+、 Fe3+、I-、SO42-C. 碱性溶液：K+、Mg2+、SO42-、NO3-D. 遇酚酞变红的溶液：Na+、K+、SO42-、Cl-