英语题完成下面5个选择题

passage one
(S1) It matters not what you learn, but when you once learn a thing, you must never give it up until you have mastered it. It matters not what you inquire into, but when you once inquire into a thing, you must never give it up until you have thoroughly understood it. It matters not what you try to think of, but when you once try to think of a thing, you must never give it up until you have got what you want. It matters not what you try to carry it out, but when you once try to carry out a thing, you must never give it up until you have done it thoroughly and well.
If another man succeeds by one effort, you will use a hundred efforts.
If another man succeeds by ten efforts, you will use a thousand.
51. According to the author, first of all one must _____.
A. obtain knowledge B. inquire C. analyze D. act
52. According to the author, _____.
A. learning is unimportant B. knowledge is unnecessary
C. thinking is of the least impo

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