第一节完形填空（共10小题；每小题2分，满分20分）

阅读下面短文，掌握其大意，然后从21 ─ 30各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

If I Were a Boy Again

   If I were a boy again, I would practice perseverance more often, and never give up a thing. If we want light, we must conquer darkness. Perseverance can sometimes  21  genius in its result. “ There are only two  22  ,” says a proverb, “ Who can surmount the pyramids – the edge and the snail.”