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完形填空 阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。 GDPGNP Governments all over the world make public reports about the condition of their economies. Most countries, including the United States, have used a measure (51) the gross national product or GNP. It includes all, (52) and services produced by citizens of the country anywhere in the world. Recently the American Commerce Department has started using a new (53) to measure production. It is known as the gross domestic product or GDP. It counts only goods and services that have been produced (54) the nations borders. Money earned by foreign companies operating in the United States is included in the GDP, but money earned by American companies operating in other countries (55). Economic experts generally approve (56) the change. They say that the gross domestic product provides a truer measure of the (57). They also note that most other industrial countries use this method. Therefore it will be easier to study the economies of different countries. Some (58) also hope the new system will help them (59) better economic policy decisions. It will provide them (60) a clearer understanding of economic activity in the US. The new measure is (61) likely to be affected by sudden changes in foreign oil prices or in the (62) of the American dollar in other countries. Economic experts believe that the change from GNP to GDP will immediately reduce the value of American production (63) at least | 
