阅读理解 Once when I was facing a decision that involved high risk, I went to a friend. He looked at me

【解析】文章大意：本文是一篇议论文。作者联系自己的经历说明了大胆的重要性，并鼓励人们有勇气和胆量。
51. C细节理解题。根据文章第二段It was usually because I had let fear of failure stop me from trying at all.可知作者过去没能达成目标是因为他害怕失败。故选C。
52. B 词句猜测题。根据后句And there is nothing mysterious about the mighty forces.可以推测出这里为“行为略高于你的能力”之意。故选B。
53. D细节理解题。根据第四段首句中Admittedly, those mighty forces are spiritual ones.可知在于他的精神力量。选D。
54. D 段落大意题。根据第五段首句Boldness — a willingness to extend yourself to the extreme—is not one that can be acquired overnight.可以知道大胆是一点点获得的。故选D。
55. A 推理判断题。根据全文内容可知作者联系自己的经历说明了大胆的重要性，并鼓励人们有勇气和胆量。故选A。