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has a new job too, on a science programme on television. Rebecca is_known (know) today and she has more money, but she still lives in the little flat in South London among her pictures and books about mountains! (五 ) Light travels at a speed which is about a million times faster _(fast) than the speed of can get some ideas of this difference by watching ( watch) the start of a you stand some distance away from the starter, you can see smoke _ rising (rise) from his gun(槍 )before the sound reaches your ears. This great speed of light produces some strange takes about 8 minutes (minute) to reach you look at the light of the moon tonight, remember that the light rays left the moon seconds before they reached 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 some cases, the light from one of tonight39。s stars _ ( star) had started on its journey to you before you were born. Thus, if we want to be honest, we can39。t say, “ The stars are_shining (shine) tonight”We have to say instead, “ The stars look were shining four years ago, but their light has only just reached the earth.”