小明在元素周期表中查找到如图所示的一格后，明白了不能把一氧化碳写成“Co”的原因。

根据材料内容，选择正确答案。

    An old man died and left his son a lot of money. But the son was a foolish young man, and he quickly spent all the money, so that soon he had nothing left. Of course, when that happened, all his friends left him. When he was quite poor and alone, he went to see Nasreddin, who was a kind, clever old man and often helped people when they had troubles.

    "My money has finished and my friends have gone," said the young man. "What will happen to me now?"

    "Don't worry, young man," answered Nasreddin. "Everything will soon be all right again. Wait, and you will soon feel much happier. "

    The young man was very glad. "Am I going to get rich again then?" he asked Nasreddin.

  "No, I didn't mean that," said the old man. "I meant that you would soon get used to being poor and to having no friends. "