A. provides B. due to C. construction D. serving

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问题    A. provides       B. due to       C. construction       D. serving       E. ascending
F. enterprise    G. despite    H. permits          I. qualified    J. adjusting
K. harmful       L offers       M. element          N. imports       O. admits
Consumers and producers obviously make decisions that mold the economy, but there is a third major【C1】________ to consider the role of government. Government has a powerful effect on the economy in at least four ways:
Direct Services. The postal system, for example, is a federal system【C2】________ the entire nation, as is the large and complex establishment. Conversely the【C3】________ and maintenance of most highways is the responsibility of the individual states, and the public educational systems,【C4】________ a large funding role by the federal government, are primarily paid for by state or city governments. Police and fire protection and sanitation services are also the responsibilities of local government.
Regulation and Control. The government regulates and controls private【C5】________, in many ways, for the purpose of assuring that business serves the best interests of the people as a whole. Regulation is necessary in areas where private enterprise is granted a monopoly, such as in telephone or electric service. Public policy【C6】________ such companies to make a reasonable profit, but limits their ability to raise prices unfairly, since the public depends on their services. Often control is exercised to protect the public, as for example, when the Food and Drug Administration bans【C7】________ drugs, or requires standards of quality in food.
Stabilization and Growth. Branches of government including Congress attempt to control the extremes of boom and bust of inflation and depression, by【C8】________ tax rates, the money supply, and the use of credit. They can also affect the economy through changes in the amount of public spending by the government itself. Direct Assistance. The government【C9】________ businesses and individuals with many kinds of help. For example, tariffs permit certain products to remain relatively free of foreign competition; 【C10】________ are sometimes taxed so that American products are able to compete better with certain foreign goods. [br] 【C2】

选项

答案 D

解析空格前的a federal system是名词短语，而空格后的the entire nation“整个国家”也为名词短语，且空格所在主句的主干部分已经完整(主系表结构)，因此可判断空格处应填入现在分词。根据常识判断邮政系统是为整个国家服务的，因此填入词库中的serving“服务”符合语境。

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