The United States is widely recognized to have a private economy because privately owned businesses play     21    roles. The American free enterprise system     22    private ownership more than public sectors. Private businesses produce     23    goods and services,     24    almost two-thirds of the nation's total economic output goes to     25    for personal use. The consumer role is     26    great, in fact, that the nation is sometimes characterized as having a "    27    economy"
    This emphasis     28    private ownership arises,     29    , from American beliefs about personal freedom. From the time the nation was     30    , Americans have     31    excessive government power, and they have sought to     32    government's authority over individuals—including its role in the economic realm.
        33    , Americans generally believe that an economy largely with private ownership is likely to operate more     34    than     35    with substantial government ownership. When economic forces are unfettered, Americans believe, supply and demand     36    the price of good and services. Prices, in turn, tell businesses what to produce; if people want more of a particular good than the economy is producing, the price of the goods     37    . That catches the attention of new or other companies that,     38    an opportunity to earn profit, start producing more     39    that goods. On the other hand, if people want less of the goods, prices fall and less competitive producers either go out of business or start producing     40    goods. 
 
【正确答案】 B
【答案解析】 本填空考查形容词,利用同现结构可以定位答案。首先分析整篇文章的中心主线为:The United States is widely recognized to have a private economy(人们普遍认为美国是私有制经济),那么后面的分述信息一定会围绕此主线和倾向展开。根据这个倾向,本填空选择一个形容词定位privately owned businesses在美国起到一个什么作用,这个作用自然是重要作用,因此选项A项insignificant(无关紧要的)明显违反此主题倾向,应排除。而选项C项magnificent(宏大的、庄严的)和D项respected(令人尊重的)均不适合修饰roles,只有选项B项important(重要的)是最符合主线倾向的词语,所以为答案。
   [参考译文]
   人们普遍认为美国是私有制经济,因为私营企业发挥了重要的作用。美国的自由企业制度更加侧重私有产权而不是公有产权。私有产业提供了大多数的商品和服务,并且几乎三分之二的国家经济产出进入了个人消费领域。消费者的角色是如此的重要,以至于美国经济有时被称做“消费者经济”。
   这种对私有产权的重视一部分来源于美国人对个人自由的信仰。自美国创建之初,美国人就担忧政府权力过大,他们就寻求限制政府对个人的权力——包括政府在经济领域所起的作用。
   而且,美国人普遍相信一个大部分由私有产权构成的经济体比由公有产权构成的经济体更有可能高效地运营。美国人相信,当经济动力没有受到束缚的时候,需求和供给决定商品和服务的价格,价格反过来指示企业生产什么。如果人们对某种商品的需求量超过经济的生产量,这种商品的价格就会上涨。这就引起了新的或者其他企业的注意,这些企业感知到了赚钱的机会,就会生产更多这种商品。另一方面,如果人们对某种商品的需求量下降,价格就会下降,那些不具有竞争力的企业要么破产,要么转而生产其他商品。