题目

Tapping on the windshield (挡风玻璃) to get his attention, I asked, “Is your taxi available?”He looked up at me, nodding, “I’m sorry. I was reading a letter.”“I’m in no hurry,” I told him. “Go ahead and finish your letter.”He shook his head, “I’ve read it several times.”“Letters from home always mean a lot.” I said.“This isn’t family.” he replied, “Old Ed was my oldest friend. He was a nice guy.”“You said ‘was’. Does that mean—?”He nodded, “Died a few weeks ago.”“I’m sorry.”After a brief silence, I heard him repeat: “I should ha5、由四舍五入得到的近似数8.31×104精确到百位．