数轴上A、B两点所对应的数分别是4和-6，则A、B两点间的距离为 A. -2 B

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The M25, the highway around London, opened in 1986. Today people      it the largest car park in Europe. Every morning on the     we hear about traffic jams, road repairs, and accidents, and which part of the M25 to avoid. One day soon we will hear “there’s a traffic jam all the way round the M25 in       directions. If you are driving to      , then it may be better for you to go back home”
Winston Churchill once said that the car was the     thing of the 20^th century. This may be       of the next century, too. Every year about 5,000 people are     on British roads. For children, road accidents are a major 主要的cause of death.
The newspaper usually      that the car is a good thing. But when you have a car and can        drive at the speed of a walking man, is it        to spend a lot of your money simply getting a car for the speed?