Part Two: English Knowledge: (Two sections, Full marks 45)
Section One: Multiple Choice (15 questions; 1 for each, full marks 15)
从A B C D 四个选项中，选出一个在句法功能上和逻辑意义上都相符合的可以填入空白处的最佳答案。
21 To succeed in a difficult task ,______________.
A) Persistence is needed B) Persistence is what you need
C ) One needs to be persistent D ) A persistent nature is needed
