It was an oral English class and in front of us was standing our teacher Lila Betray, who was a university student from the US. Somehow we came to the point whether any of us could sing an English pop song in front of the class. You know, maybe three or more out of ten Chinese students are shy in class. As a result, there was silence in class for quite a while, which made everybody feel rather embarrassed (尴尬的), including the teacher.

    I was a shy boy. However, just at that moment, a great idea struck me suddenly. “Seize the enjoyment! Seize the chance. Yes, there couldn't be a better chance.” I said to myself. “Why not seize it? Why should I have always to be the guy regretting missing the opportunity just because of shyness? Yes, maybe I should have a try!”

    So, I raised my hand. And I remember that it took me quite a while to think what the song's name was. Though I sang no more than five sentences because of forgetting the lyrics (歌词), their clapping hands told me that I did the job well. Later, I got a gift and I was really happy.

    I think that is one of the most unforgettable moments in my life. Through this experience, I've also got to know that we should believe that we can do the job well, no matter how difficult it seems for us. Just have a little more courage.

歌德说：“你若要实现你自己的价值，你就要给社会创造价值。”这句话是说（    ）

冷光灯的发明使用的原理是（    ）

阅读下面的文言文，回答问题。

    吕蒙字子明，汝南富陂人也。少南渡，依姊夫邓当。当为孙策将，数讨山越①。蒙年十五六，窃随当击贼，当顾见大惊，呵叱不能禁止。归以告蒙母，母恚欲罚之，蒙日：“不探虎穴，安得虎塑”母哀而舍之。

    鲁肃。代周瑜，过蒙屯下。肃意尚轻蒙，或说肃目：“吕将军功名日显，不可以故意侍也，君宜顾之。”遂往诣蒙。酒酣，蒙问肃日：“君受重任，与关羽为邻，将何计略，以备不虞?，，肃造次。应日：“临时施宜。”蒙曰：“令东西虽为一家，而关羽实熊虎也，计安可不豫定?”因。为肃画五策。肃于是越席就之，拊。其背日：“吕子明，吾不知卿才略所及乃至于此也。”

【注释】①山越：扬州山岳地带的异族。②鲁肃：鲁肃是三国时期吴国名将。③造次：鲁莽，轻率。④因：于是。⑤拊：抚摩。