八下 英語 選詞填空
before,discover,fast,in,come,watch,so,fast,it,ago,shine,not can
Light travels at a speed which is about a million times ( ) than that of sound.( ) one second,lidht travels about 300,000 kilomemters,but sound traves only 340 meters.You can get some idea of this gifference by ( ) the start of a running match.If you stand far away from the starter(發(fā)令員),you can see smoke ( ) from his gun ( ) the sound reaches your ears.
The fastspeed of light producessome strange facts.The nearest star is ( ) far away that light which you can see from it tonight started to travel to your years ( ) at a speed of nearly two million kilomemters every minute.The light from some oftonight's started on.( ) journey towards you even before you were born.
So,if we want to be honest (誠實）,we ( ) say,"The stars are shining brightly tonight."We have to say,"The stars look nice.they were ( ) four years ago but their light has just reached our earth."