[解析]
(1)A.推理判断题。根据原文第一段"Self confidence (自信)is the answer to success,or we can say the most important step to success.自信是成功的答案,也可以说是通往成功最重要的一步。"可知作者在第一段告诉我们自信是成功的关键。故选A。
(2)D.细节理解题。根据原文第二段"that is because self confident people realize the impact of believing in themselves and relying on their own abilities.这是因为自信的人意识到相信自己和依靠自己能力的影响。"可知自信的人会成功是因为他们相信自己并且有能力。故选D。
(3)A.推理判断题。根据原文第二段"However,a person who is learned but lacking confidence might fail in making you agree with the same.然而,一个博学但缺乏自信的人可能无法让你同意同样的观点。"可知没有自信的知识渊博的人他会在工作和生活中失败。故选A。
(4)A.推理判断题。根据原文最后一段"Self confident people recognize themselves as able to attain those things they set out to do and this recognition creates reality in their lives.成功通过每一项新的成就建立起你的自信。自信的人认识到自己能够实现他们开始做的事情,这种认识在他们的生活中创造了现实。"可知作者在最后一段表明了成功与自信的关系。故选A。