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电动自行车在近几年逐渐发展成为人们的主要交通工具之一.电动自行车是利用蓄电池给车上的电动机供电,目前的电动自行车使用的大多是铅酸蓄电池,使用寿命一般是一年左右.试从环保的角度分析使用电动自行车的利与弊.

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答:电动自行车的优点:使用燃料为动力的车产生的尾气中含有一氧化碳、二氧化氮、二氧化硫等气体有害气体,行驶过程中电动自行车不会产生这些有害物质.因此电动自行车工作时不排尾气、且噪声很小.电动自行车的缺点:铅酸蓄电池是现在电动车主要采用的电池,废弃的铅酸蓄电池对土壤和人体健康的危害很大.

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    October 15th is the Global Hand washing Day. Activities are planned in more than 20 countries to get millions of people in the developing world to wash their hands with soap(肥皂). For example, donators(捐献者)will give 150,000 bars of soap to schools in Ethiopia.

    Experts say people around the world wash their hands every day, but very few use soap at so-called important moments. These include after using the toilet, after cleaning a baby and before touching food.

    Global Hand washing Day is the idea of the Public-Private Partnership for Hand washing with Soap. Partners include the United Nations Children's Fund, American government agencies, the World Bank and soap makers Unlever and Procter and Gamble. The organizers say all soaps are equally effective at removing disease-causing germ(细菌). They say the correct way to wash is to wet your hands with a small amount of water and cover them with soap. Rub it into all areas, including under the fingernails. Rub for at least twenty seconds. Then rinse well under running water. Finally, dry your hands with a clean cloth or wave them in the air.

    The Partnership for Hand washing says soap is important because it increases the time that people spend in washing hands. Soap also helps to break up the dirt that holds most of the germs. And it usually leaves a pleasant smell. The Partnership for Hand washing also says washing with soap before eating or after using the toilet could save more lives than any vaccine(疫苗)or medicine. Hand washing could also prevent the spread of other diseases. When people get germs on their hands, they can infect(传染)themselves by touching their eyes, noses or mouths. Then they can infect others.