—Do you know sound travels very fast?
一Yes. But light travels _________ sound.
| A． much faster than | B．a little faster than |
| C．as fast as | D．slower than |
—Do you know sound travels very fast?
一Yes. But light travels _________ sound.
| A． much faster than | B．a little faster than |
| C．as fast as | D．slower than |
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