根据短文内容，将下面方框内的句子还原到文中空白处，使短文内容完整，通顺，每个选项只能用一次，其中有一个选项是多余的。
Once my mother told me a story. In Africa, when an antelope(羚羊) wakes up ever-y morning, the first thing it thinks about is, "I must be able to run faster than the fastest lion, or I will be killed. "
So, almost at the same time, they get up and start running toward the rising sun.
This is life full of chances and challenges.
For students, it is just the same. If we do not study hard, sooner or later, we will fall behind the other students. At first, I did not know what the word "exam" meant. Later, I knew an exam was a kind of competition. In competition, there are always winners and losers. As I grew up, l got to know competition well.
Each time I saw children playing games, and heard their laughter, I wished I were that age again. so I picked up my pen and began to study hard again.
I was still not sure what competition really meant. One day, I was taking part in an English-speaking contest. When I went to the stage, I saw other students looking at me kindly. It is not as cruel as my teacher and parents told me. In fact, com-petition is the opposite—it is kind and necessary.
I learned a lot from realizing this fact. Now 1 understand more about the world. Competition is important for us all.
| A. When a lion wakes from its dream, the first thing it thinks about is," I must be able to catch the slowest antelope, or I will starve to death. " B. I suddenly knew what competition was. C. There must be competition in one's life, so people can improve. D. However, l remembered my parents' words, "You must work very hard in order to have a good future." E. Whether you are an antelope or a lion, you must go ahead when the sun rises. F. I finally realized I was old. |
B. 
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F. 