If there is any single factor that makes for success in living,it is the ability to profit by defeat

题目

If there is any single factor that makes for success in living,it is the ability to profit by defeat.Every success I know has been achieved because the person was able to analyze defeat and actually profit by it in his next undertaking.Confuse defeat with failure,and you are doomed indeed to failure,for it isn’t defeat that makes you fail:it is your own refusal to see in defeat the guide and encouragement to success.
Defeats are nothing to be ashamed of.They are routine incidents in the life of every man who achieves success.But defeat is a dead loss unless you do face it without feeling ashamed,analyze it and learn why you failed.Defeat,in other words,can help to cure its own cause.Not only does defeat prepare us for success,but nothing else can arouse within us such a compelling desire to succeed.If you let a baby grasp a rod and try to pull it away,he will cling more and more tightly until his whole weight is suspended.It is this same reaction that should give you new and greate

答案

这篇文章讲的是要正视挫折,并从挫折中积累经验
16题应该选b,b是上面说的文章主旨的一部分,A的语气order太强硬；c只是个例子,D并非文章的正面意思或者说主要意思
17.C
18.B
19.C
20.像16里说的一样,c只是个例子,并不是文章要说明的主要问题,这里我觉得选A或D都可以,A有探索、利用的意思,D是学习,但是学习power这个好像不是太合适,探索一种力量,利用一种力量可能更通顺一些,所以选A吧