阅读理解 Once upon a time, there lived an old man. He had three sons. One day, he called them together and said, "Sons, I will die soon. To my eldest son give half my camels, to my second, one third(三分之ー), and to my youngest, one ninth(九分之一)." Soon after that he died. The old man had seventeen camels, and the three brothers didn't know how to do as their father said. They thought for a long time about the problem, and it seemed that they must either kill some of the camels and cut them into pieces, or disobey their father. At last, they went to their father's old friend and asked for his advice. As soon as he heard their story, he said. "I will help you. I was a good friend of your fathers. I am old. I have only one camel, but take it. It is yours." The three sons thanked the old man and took his camel. Now they found it was easy to do as their father wished. The eldest took half—that was nine camels; the second took one third—that was six; and the youngest took one ninth—that was two. After each had got his camels, they found that there was still a camel there. To show their thanks to their father's friend, they gave the camel back to him.（1）How many camels did the first old man have? A．Only one.B．Three.C．Seventeen.D．Eighteen.（2）The underlined word "disobey" means"_______" in Chinese. A．服从B．违背C．听从D．嘲笑（3）Why did the second old man give his camel to the three brothers? A．Because he didn't like them.B．Because he wanted to help them.C．Because he wanted to punish them.D．Because he wanted to trick them.（4）What's the best title for the passage? A．How to divide camelsB．The old man's good friendC．Three clever brothersD．The old man's camels