下列现象中利用了回声的是（）。
A.渔民利用声呐探测鱼群B.雷雨天时，先看到闪电后听见雷声C.在马路两旁植树造林D.录音棚内用软泡沫塑料隔音

完形填空。

  You can tell when people have a passion for something. Their eyes light up when they talk about it. They will spend hours doing what  1  them. My friend Marilyn has a passion for  2 . She has developed her talent over the years because of her  3  of music.    She would play at parties, and church events  4  her passion with everyone. Over the years, many people  5  her and gave her the confidence that  6  her producing a CD with a selection of her favourite songs.     Marilyn was in her 60s when she produced her first CD. Her  7  seemed to quiver （轻微颤动) as she told me  8  it. You could hear her passion for music  9  she described the experience of recording the CD. She had 20 been in a recording studio （录音棚 ) in her life, but now she was recording a CD in a professional studio. Her passion brought her 21 .     What is your passion？ Have you found it？ Have you 22 it？ Should let your passion out and make it a reality. Do something that you love to do and make it a reality. As Eve sawyer said, "Never look down upon the 23 of passion." If you 24 have a passion for something, you will 25 a way to achieve it. Your passion will help you 26 the challenges as you start your journey.    If you are not 27 what your passion is, think of what makes you jump out of your 28 in the morning. What is the one thing that you love to do？ 29 it and do it! Don't ask yourself what the world needs; ask yourself what makes you come alive, 30 what the world needs is people who have come alive.

（   )1. A .upsets   （   )2. A. dance  （   )3. A. love   （   )4. A. offering  （   )5. A. advised  （   )6. A. led to   （   )7. A. feeling  （   )8. A. about   （   )9. A. though   （   )10. A. always   （   )11. A. success  （   )12. A. hoped   （   )13. A. force  （    )14. A. hardly   （   )15. A. find   （   )16. A. obey   （   )17. A. doubtful  （   )18. A. room   （   )19. A. Discuss  （   )20. A. before  

B. bores   B. music   B. care    B. providing  B. encouraged   B. relied on  B. song    B. in     B. unless   B. often   B. luck    B. developed  B. rule    B. barely     B. leave   B. express   B. sure    B. chair   B. Promise   B. because  

C. comforts  C. art    C. study   C. sharing   C. praised   C. insisted on  C. appearance  C. at     C. as     C. ever    C. hope    C. grew    C. power   C. briefly   C. give    C. face    C. willing   C. bed    C. Notice   C. when   

D. excites    D. action    D. choice    D. sending    D. moved     D. brought up  D. voice     D. for      D. till     D. never     D. money     D. used                  D. ability    D. truly     D. make     D. behave    D. content    D. mind     D. Find     D. if