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— Wait a minute. It's dangerous for us ____________________ it while crossing the street.

    You and your family are1a picnic for tomorrow. But you want to2the weather forecast(预报) first to see whether there will be rain or not. Your father turns on the television and the family listen to the3make. the weather report.

    "It will be partly cloudy tomorrow morning，4clearing by early afternoon. The high temperature tomorrow will be 35."

    As there will be no rain, the whole family feels5. Without the weather forecast, you would not know this, and you would just have to take your chances. But now you can plan your picnic6worrying whether it will rain or not.

    The man you can thank for this is Cleveland Abbe. He is known7the father of the US Weather Bureau. He was the first person to publish8weather forecasts in the United States.

     Abbe began his daily weather bulletins(简报) in 1869. They were based on weather9he drew from telegraphed reports of weather conditions. Because of their accuracy(准确)，the reports were !10.

    Congress(国会) became11in Abbe's weather reports. They made Abbe a meteorologist (someone who studies. weather conditions)， and he12 issuing (发布) forecasts three times a day. He was the first official forecaster of the US Weather Service. Because he often forecast probable storms, Abbe earned the nickname of “Old Probabilities".

    All week long, it seems you sit inside at school when it is fine outside. But when the weekend comes, it is very cloudy. There is rain in the weather report, In some ways, you may be right. Scientists studied more than 40 years of weather data(数据) from around the world. It shows weekend weather is different from weekday weather in some places.

    Part of the study involved(包括) 660 weather stations in the US. At more than 230 of these places， the weather on Saturday, Sunday, and Monday was different from the weather on Wednesday, Thursday, and Friday. The difference was small, but the pattern was striking enough to make the scientists take notice.

    "This kind of weekly rise and fall isn't any natural cycles( 自然周期变化),” the scientists say. Instead, they think that air pollution from human activities makes the weather become different.

    Car Free Day encourages drivers to give up their cars for a day to protect the environment. People from around the world get together in the streets to remind the world that we don't have to accept the society full of cars. It was first started by 35 cities in France, and September 22 is Car Free Day. The first Car Free Day in China was in Chengdu in 2001. The slogan for the day is “If we drive for one less day, we can have one more nice day".

    Organized activities are held in many cities on Car Free Day. In Brussels, Car Free Day shall be 0 valid(有效的) for everybody except persons with a special permit(许可证)，but they have to slow down to the speed of 30 kilometres per hour. The public transportation is free on that day. In London, they have special “green areas” Walking， biking and public transportation are encouraged. The streets are open only to walkers, bicycles and buses from 7:00 am to 7:00 pm. In Beijing, it asks drivers to leave their cars at home for one day each month and walk or ride a bike to work. More and more people are joining in the activity. We must do more for Car Free Day as a Beijing driver said, “We may not change the weather, but we can choose not to drive.”

    But we do not want just one day and then return to “normal” life. We should go on with Car Free Day.

, Dalian is a beautiful city.

Mr Smith said that .