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  3. Consumers and producers obviously make decisions that mold the economy, but there is a third major【C1】______to consider, the rol

Consumers and producers obviously make decisions that mold the economy, but there is a third major【C1】______to consider, the rol

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问题     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【C2】______on the economy in at least four ways:
    Direct Services. The postal system, for example, is a federal system【C3】______ the entire nation, as is the large and complex establishment. Conversely the【C4】______and maintenance of most highways is the responsibility of the individual states, and the public educational systems, 【C5】______ a large funding role by the federal government, are primarily【C6】______for by state or city governments. Police and fire protection and sanitation services are【C7】______the responsibilities of local government.
    Regulation and Control. The government regulates and controls private enterprise, in many ways, for the【C8】______of assuring that business serves the best interests of the people【C9】______a whole. Regulation is【C10】______in areas where private enterprise is【C11】______a monopoly, such as in telephone or electric service. Public policy【C12】______ such companies to make a reasonable profit,【C13】______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【C14】______drugs, or requires standards of 【C15】______in food.
    Stabilization and Growth. Branches of government including Congress attempt to control the extremes of boom and bust of inflation and depression, by【C16】______tax rates, the money supply, and the use of credit. They can also【C17】______the economy through changes in the amount of public spending by the government itself.
    Direct Assistance. The government【C18】______businesses and individuals with many kinds of help. For example, tariffs permit certain products to remain relatively【C19】______of foreign competition; imports are sometimes taxed【C20】______American products are able to compete better with certain foreign goods.
【C10】
选项 A、optional
B、necessary
C、useless
D、flexible
答案B
解析 下一句其实是对本句说的regulation“规范”的解释，说明这种“规范”一般是怎么操作实施的，末尾部分since．．．services还点明了为何要进行规范的原因——公众依赖这些企业的服务，由此可知这种规范是有需要、有必要的，B项necessary“必要的”符合文意。
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