- 问题详情:ManyrulesgoverndriversonAmericanstreetsandhighways.Themostcommononesarethespeedlimits(限制).Thespeedlimitscontrolhowfastacarmaygo.Onstreetsinthecity, thespeedlimitisusually25or35milesperthehighwaysbetweencities,thespeedlimitisusually55milesp...
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