填空题
[听力原文]11-15
Many rules govern drivers on American streets and highways. The most common ones are the speed limit. On streets in the city, the speed limit is usually 25 or 35 miles per hour. On the highways between cities, the speed limit is usually 55 miles per hour. When people drive faster than speed limit, a policeman can stop thru and gives them traffic tickets. Traffic tickets tell the drivers how much money they must pay. When drivers receive too many tickets, they probably cannot drive for a while. The rush hour is when people are going to work or going home. At rush hour there are many cars in the streets and traffic moves very slowly. Nearly all American cities have rush hours. Drivers do not get tickets very often for speeding in the rush hours because they cannot drive fast.