通读下面短文，掌握其大意，然后从所给的A、B、C、D四个选项中选出最佳选项。

    Hello, my name is Diana. I have a brother, Steve. We grow up together,1we are very different. For example, I'm outgoing, but he is2. I love English. I3studying English when I was little and I'm studying harder now. My brother didn't like it at first. However, when I learned some English songs, I often sang to him. Now he not only loves to listen to English songs, but4likes to sing! My brother can swim very well. I was not good5swimming in the past. Last summer, he took me to the6every day and helped me learn 7to swim. Now I can swim8than all my friends! I enjoy telling jokes. My brother can never remember a9, but he likes to listen to them. Every day I make him10by telling him jokes.