Trắc nghiệm: Although thunder and lightening are produced at the same time. light waves travel faster _____. so we see the lightening before we hear thunder. | Gửi trắc nghiệm |
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Trắc nghiệm: Although thunder and lightening are produced at the same time. light waves travel faster _____. so we see the lightening before we hear thunder. | Gửi trắc nghiệm |