选词填空 light travels at a spend which is about a

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• 选词填空 light travels at a spend which is about a
• Light travels at a speed which is about a million times faster than the speed of sound.In one second,light travels about
• light travels at a speed which is about a million times faster than the speed of sound
• 判断正误Light travels at a speed which is about a million times 急.
• Light travels at a speed which is about a million times faster than the speed of sound.In one second,light travels about 300,000km.But sound travels only 344m.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 comes from his gun before the sound reaches your ears.This great speed of light gives us some strange facts.Sunlight takes about 8 minutes to reach us.If yo
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