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若复数不是纯虚数，则的取值范围是(  ) A.或   B.且   C.      D. 答案：CIt’s not easy to find a person with the qualities（品格）it takes to be a hero. I didn’t really understand the meaning of the word “hero” until my third year in the college.If you saw her, you wouldn’t think she really looks the part, but she is stronger than Superman could ever be. Her name is Sandra Keierleber. I first met her at volleyball tryouts（选拔赛）, but didn’t notice anything special at first. As the week passed, however, she showed she had more heart than anyone. She stood out because she never gave up, no matter what.Sandra isn’t the tallest or the fastest－in fact, this was her first time playing volleyball and it showed－but that didn’t stop her. She was always the first to arrive and the last to leave. By the end of tryouts she had found a place in everyone’s heart. When the name list for new members was put up, we all waited nervously as she checked. When she stood at the door and smiled happily, all we could do was cheer.After Sandra made the team, she worked even harder to improve her game. When she asked for help, we gladly taught her. She also became our fan, attending almost every school game and even joining us in the city games. We all like her, because she never thinks about doing things the easy way, or losing that smile. Because of her great efforts, she makes herself a true hero－and my hero, too.根据短文内容，选择最佳答案。【1】What did the writer think of Sandra Keierleber at the beginning?A. Strong. B. Honest. C. Pretty. D. Common.【2】When did Sandra begin to play volleyball?A. When she was at college. B. When she was tall enough.C. When she became a hero. D. When she met the Superman.【3】Which of the following is true about Sandra?A. She was born a volleyball player. B. She isn’t the tallest but the fastest.C. She does things in an easy way. D. She is popular with her teammates.【4】What did the writer and her classmates do when they knew Sandra was on the name list?A. They held a party. B. They cheered Sandra.C. They cried. D. They did nothing.【5】Why does the writer think of Sandra Keierleber as a true hero?A. Because she did very well at the tryouts.B. Because she worked hard and never gave up.C. Because she took part in the city matches.D. Because she asked for help from her teammates.