【正确答案】 1、Y    

【答案解析】[题眼] A large percentage of severe depression can be relieved or treated but in reality，most of them are not seriously taken．
[定位] 第1个小标题Types of Depression部分的第3段最后一句：Although treatment can help more than 80 percent of people with severe depression，most people with depression do not seek treatment．
[解析] 根据原文可知有80%的重性抑郁症患者能得到治疗，但是大部分抑郁症患者却没有寻求治疗，也就是说大部分人都没有足够地重视自己所患的抑郁症，故本题答案为Y。