夏天雷雨天气时，因为声速比光速小得多，所以我们总是先看到闪电后听到雷声．现在假设声速和光速一样快，请你猜想一下，我们周围的世界会发生什么变化？写出一个场景：______．
由于声音的传播速度远小于光速，所以出现了先看到闪电后听到雷声、百米赛跑时，计时员以看烟计时，而不是听枪声计时等场景．
当两者速度相同时，由于两者速度不同而造成的场景将不再出现．即：夏天打雷时，看到闪电和听到雷声同时发生；百米赛跑时，计时员可以听枪声计时．
从方框中选用合适的词并用其适当形式填空。
小题1:How ___________ it was to hear that some pop stars would come to our town. 小题2:The micro letter is used ___________ in China. It has over 300 million users. 小题3:— Mary, could you tell me who invented ___________? — A team of scientists, John Bardeen, Walter Brattain and William Shockley. 小题4:Do you know what the ___________ of the tower is? About twenty metres. 小题5:We enjoyed ___________ trip to the Statue of Liberty very much. What great fun we had! |
