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完形填空： 本部分为1篇300～450词的短文，文中有15处空白，每处空白给出4个选项，要求应试者根据短文的内容从4个选项中选择1个最佳答案。 Lets Have a Little Cooperation Please Cia Andina do Triconos (CATSA)， a Bolivian joint venture of the U.S. Dresser Industries and local investors， which and based its investment _____(1)_____ an allocation under the metalworking program， closed its doors after _____(2)____ to penetrate the Andean market after more than two years in operation. The prospect of _____(3)_____ access to the Andean market， plus protection provided by a 55 percent ad valorem common outer tariff on bits sourced from outside the bloc， made the sales outlook seem _____(4)_____. However， CATSAs monopoly position in Ancom proved specious. _____(5)_____ the plant went on stream in 1974， the company was never able to export a single drill bit to the Andean market; and its local sales were _____(6)_____ a state-owned petroleum company. This market was clearly _____(7)_____， since the operation had been based on exporting the bulk of the plants 200-unit-per-month capacity to the Andean area. CATSA could not penetrate the Ancom market for several reasons： Although Ancom _____(8)_____ a 55-percent common outer tariff on third-country imports， some Ancom countries had previously _____(9)_____ LAFTA (Latin American Free Trade Association) tariff concessions， which take precedence over the Ancom tariffs. | 
