单项选择题

Consumers and producers obviously make decisions that mold the economy, but there is a third major 41 to consider the role of government. Government has a powerful 42 on the economy in at least four ways:
Direct Services. The postal system, for example, is a federal system 43 the entire nation, as is the large and complex establishment. Conversely, the construction and 44 of most highways the 45 of the individual states, and the public educational systems, despite a large funding role by the federal government, are primarily 46 for by country or city governments. Police and fire protection and sanitation 47 are also the responsibilities of local government.
Regulation and Control. The government regulates and controls private 48 in many ways, for the 49 of assuring that business serves the best 50 of the people as a whole. Regulation is necessary in areas where private enterprise is granted a 51 , such as in telephone or electric service. Public policy permits such companies to make a reasonable 52 , but limits their ability to raise prices 53 , since the public depends on their services. Often control is 54 to protect the public, as for example, when the Food and Drug Administration bans harmful drugs, or requires standards of 55 in food. In other industries, government sets guidelines to ensure fair competition without using direct control.
Stabilization and Growth. Branches of government, including Congress and such entities as the Federal Reserve Board. attempt to control the extremes of boom and bust, of inflation and depression, by 56 tax rates, the money supply, and the use of credit. They can also 57 the economy through changes in the amount of public spending by the government itself.
Direct Assistance. The government provides many kinds of help to 58 and individuals. For example, tariffs 59 certain products to remain relatively free of foreign competition; imports are sometimes taxed so that American products are able to 60 better with certain foreign goods. In quite a different area, government supports individuals who cannot adequately care for themselves, by making grants to working parents with dependent children, by providing medical care For the aged and the indigent, and through social welfare system.

A.beverage
B.businesses
C.bondage
D.botany