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        Experts say that agriculture provides fourteen percent of the world's greenhouse gas emissions (排放) each year. The gases released include carbon dioxide, a major cause of global warming.

        Twenty-one nations around the world recently joined forces to better understand and prevent greenhouse gas emissions from farms. The Global Research Alliance on Agricultural Greenhouse Gases was launched (发起) at the United Nations conference on climate change. The meeting took place in Copenhagen，Denmark last month.

    Agricultural experts blame a number of farm activities for producing greenhouse gases. For example,  animal waste and cattle digestive (消化) systems release methane(甲烷,沼气) gas. Fertilized soil and the burning of crop waste also release harmful gases into the air. Experts say some methods of farming---turning the soil to prepare for planting---also release harmful carbon dioxide.         

    An official of the European Commission’s Directorate Genera1 for Research says agricultural greenhouse gas emissions can be cut. Maive Rute suggests feeding animals a diet designed to reduce emissions.

        The new agricultural research group says protecting against global warming is only part of its purpose. It says the world also needs to develop better farming methods to feed growing populations in poor countries.

        United States Agriculture Secretary Tom Vilsack said no one single nation can fight agricultural greenhouse gas emissions and increase food production at the same time. This is why the alliance is important for combining resources and finding new ones.

        The United States Department of Agriculture (USDA) will increases spending on farm emissions research by ninety million dollars over the next four years. The total will reach one hundred thirty million dollars. The USDA will share the research with other countries in the Global Research Alliance on Agricultural Greenhouse Gases and support researchers from developing countries that belong to the alliance. Money from the Borlaug Fellowship program will let the researchers study agricultural climate change with American scientists.

        Mister Vilsack said that just as climate change has no borders (边界), there should be no borders for research.

    68. In Paragraph 4，Maive Rute recommends ______.

    A. increasing food production

    B. changing cattle digestive systems

    C. developing better farming methods

       D. giving animals the food meant to produce fewer emissions

    69. The underlined word"alliance"in Paragraph 6 probably means _____.

        A. Action or state being joined together

        B. An agreement signed between countries

        C. A program or project set up for a research

        D. An organization formed for different goals

    70. How much has the USDA spent on farm emissions research so far?

    A. 130 million dollars.       B. 220 million dollars

    C. 40 million dollars.        D. 90 million dollars.

    71. The purpose of the passage is to ______.

    A. suggest a total ban (禁令) on farm activities

    B. introduce Copenhagen conference held last month

    C. appeal (呼吁) countries to cut agricultural emissions

    D. inform readers of the major cause of global warming

    DACC

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