小题1:C
小题2:C
小题3:D
小题4:A
小题1:C 细节理解题。短文第三段表述“二十多年来，科学家们认为高度自信是成功的关键”，但从第四段中的“Now, new research shows that focusing just on building self-esteem may not be helpful”一句可知“新的研究表明高度自信可能不是成功的关键”。
小题2:C 细节理解题。根据短文中“People with high self-esteem can have big egos”和“People with high self-esteem tend to think more of themselves”两句分析可知。
小题3:D 推断题。从下文“He believes that violent and wicked people often have the highest self-esteem of all”一句推断，句中的better 表示的意义必须是同violent and wicked的意义相反。
小题4:A 推断题。从“药方”的内容上分析，建议人们放下架子，敢于承认错误，由此可推断此“良方”是为过度自信的人所开的。