小题1:D
小题2:B
小题3:A
小题4:C
Light travels at a speed which is about a million times fast
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light travels at a speed which is about a million times fast
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英语翻译Light travels at a speed which is about a million times
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连词成句（英语——初一）second、speed、a、of、300,000km、light、per、travels、at