现代战争与其说是军事上的比武，不如说是科技上的较量．激光武器也成为各国争相研究的对象，“快、准、狠”是它的三大特点：光的传播速度比一般攻击型武器快得多，激光在空气中的速度近似等于真空中的速度，约为　 ____　km/s，使得激光束能够快速打击目标；由于光是沿 ____传播的，所以激光武器更能准确打击目标；另外，由于激光的能量强且集中，激光束击中目标后，会使得目标物迅速发生 ____并进一步汽化成蒸气，汽化时产生的强烈冲击波会“撕碎”目标物体，造成毁灭性打击。

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    Fourteen-year-old Emma Peters is talking about her coming summer holidays．

    "Soon it will be the summer holidays again．I'm not going away with my parents this year but I don't1．I'm going to2my time with two of my classmates，Bella and Lou．

    We've just started a band (乐队)．We call it Sunshine．I play the guitar(吉他)and sing．Bella plays the piano and Lou plays the drums．We 3in Lou's dad's garage(车厍)and we also play in small coffee shops．We're 4 very good friends．We love and help each other．I was in a different band last year but that wasn't so much5.No one wanted to practise．

    "We've written several songs and we have our own website (网站)．Over the summer holidays we are going to make a CD 6ten or maybe twelve songs on it．We're not quite sure yet．We haven't finished writing all the songs，7 we've decided on the name of the CD．We're going to call it The Red Room．The CD may not make8famous，but that doesn't matter—we just enjoy our music and hope to 9it with other people．I can't think of a better10to spend the summer holidays．”