【正确答案】 1、Y    

【答案解析】[题眼] Optimists and pessimists differ in their focus when they look at the same thing． [定位] 第1个小标题Influence on their abilities下第1段最后一句：In part，that's because optimists and pessimists deal with the same challenges and disappointments in very different ways． [解析] 对比分析题目和原文，可以看出题目和原文用词不一样，但意思一致，所以答案是Y。