人教新目標(biāo)版英語八年級下冊unit7what’sthehighestmountainintheworldword單元綜合測試-文庫吧資料
2024-12-11 11:12本頁面
【正文】 passage. Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke from his gun before the sound reaches your ears. This great speed of light produces some strange facts Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km. per minute. In some cases, the light from one of tonight’s stars had started on its journey to you before you were born. Thus, if we want to be honest, we can’t say, “The stars are shin
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