题目

 “Dash” is a symbol which represents every day we’ve spent alive on earth. Therefore, how you spend your “dash” is important. Recently I   21   about a little girl named Hope. After learning more about her life, I couldn’t help but feel it was not by coincidence, nor happenstance (偶然事件),   22   she had been named “Hope”. The strong feeling of sympathy and generosity   23   in her young heart made a lasting impression on me and countless others.   24   I never had the opportunity to meet her, I wish I had. Hope was a twelve-year-old girl who wa物理学的发展丰富了人类对物质世界的认识，推动了科学技术的创新和革命，促进了物质生产的繁荣与人类文明的进步。下列表述正确的是 A．牛顿发现了万有引力定律       B.洛伦兹发现了电磁感应定律 C．光电效应证实了光的波动性     D.相对论的创立表明经典力学已不再适用