25.D细节理解题。根据第三段中的“ And all of us guys would lean against the wall until she passed. Then we'd burstnto laughter. How rude is that?”可知, Bruce和其他男生都紧靠着墙,直到 Kathleen走过去,然后他们突然大笑起来,这是非常无礼的;并结合第四段中的“ The women said none of the teachers cared about it”和“ We just kept it toourselves”可知,没有任何老师对此表示关心,她们也不对别人说;据此可推知,it指代 Kathleen因受到同班同学的嘲笑而遭受的精神上的痛苦,故D项正确