A、On 5 June. B、On 20 March. C、On 15 July. D、On 26 April. A信息明示题。本题关键句为“World Environment Day，commemorated each year on 5 June”，世

(32)World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. (33)World Environment Day can be celebrated in many ways, including street rallies, bicycles parades, green concerts, essay and poster competitions in schools, tree planting, recycling efforts, clean-up campaigns and much more.
    Heads of State, Prime Ministers and Ministers of Environment deliver statements and commit themselves to care for the Earth. (34)World Environment Day, commemorated each year on 5th June is one of the principal vehicles through which the United Nations stimulates worldwide awareness of the environment and enhances political attention and action. (35)The World Environment Day theme selected for 2007 is "Melting Ice—a Hot Topic?". The WED theme ,selected for 2007 focuses on the effects of climate change on the polar environment and on the globe in the whole
    The main international celebrations of the World Environment Day 2007 were held in Norway. UNEP is honored that the City of Troms is to host this day.
    The day’s agenda is to ask human beings to face the environmental issues; empower people to become active agents of sustainable and equitable development; promote an understanding that communities are important to changing attitudes towards environmental issues; and advocate partnership, which will ensure all nations and peoples enjoy a safer and more prosperous future.