A. five times fewer patients die after being operated on B. 20 percent fewer of all operation patients die C. 20 percent of all operation patients recover D. operation deaths have increased by 20 percent. 参考答案:A 答案解析:根据文章的第三段中“Deaths from most operations are about 20 percent...1910.”选项A从原文相反的角度说明这点。选项B是“低于所有手术病人的20%