4 When you are crossing a road, stand well back from the curb(路缘)while you wait for the light to change. Every meter really does count when you are close to traffic. As the traffic begins to move, fumes can be reduced in just a few seconds. So holding your breath for just a moment can make a difference, even though it might sound silly.

　　5 There are large sudden pollution increases during rush hours. Pollution levels fall during nighttime. The time of year also makes a big difference. Pollution levels tend to be at their lowest during spring and autumn when winds are freshest. Extreme cold or hot weather has a trapping effect and tends to cause a build-up of pollutants.

　　23　Paragraph 2

　　24　Paragraph 3__________

　　25　Paragraph 4__________

　　26　Paragraph 5__________

　　A　Where you stand while waiting to cross

　　B　Where you walk

　　C　Where you sit on a bus and how you

　　D　When you go to bed

　　E　When pollution levels rise and

　　F　When you get up

　　27　Air pollution can be as harmful to ones health .

　　28　Traveling on an underground train can reduce exposure .

　　29　Pollution levels are lower .

　　30　Its wise to stay away from heavy traffic .

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