参考答案：错

解析：
For most of their lives, the two men had shared confidences, swapped advice and supported each other’s ambitions. The dozens of letters that Justice Blackmun saved document a relationship of sometimes startling intimacy.

[分析]： 事实细节的判断。
该题干中有三处主要细节需要与原文对应后判断是否正确，即：very intimate，reliable friends和throughout their fives。原文中startling intimacy可与very intimate对应，原文中…had shared confidences, swapped advice and supported each other’s ambition可与reliable friends对应，而原文中most of their lives和题干中的throughout their lives并不吻合，因此该题的说法是错误的。
[解题关键] 将选项信息与原文相关信息对照，可得出正确答案。