单选题
{{B}}Directions:{{/B}}{{I}} There are 10 questions in this part of the test. Read the
passage through. Then, go back and choose one suitable word or phrase marked A,
B, C, or D for each blank in the passage. Mark the corresponding letter of the
word or phrase you have chosen with a single bar across square brackets on your
Machine-scoring Answer Sheet.{{/I}} Public
goods are those commodities from whose enjoyment nobody can be{{U}}
{{U}} 1 {{/U}} {{/U}}excluded. Everybody is free to{{U}}
{{U}} 2 {{/U}} {{/U}}the benefits of these commodities, and one
person's utilization {{U}} {{U}} 3 {{/U}} {{/U}}the
possibilities of anybody else's enjoying the same goods.
Examples of public goods are not{{U}} {{U}} 4 {{/U}}
{{/U}}one might expect. A flood control dam is a public goods. Once the dam is
built, all the people living in the area will benefit{{U}} {{U}} 5
{{/U}} {{/U}}their own contribution to the construction cost of the dam. The
same{{U}} {{U}} 6 {{/U}} {{/U}}true for highway signs or aids to
navigations. Once a lighthouse is built, no ship of any nationality can be
effectively excluded from the{{U}} {{U}} 7 {{/U}} {{/U}}the
lighthouse for navigational purposes. National defense is another example. Even
a person who voted against military expenditures or{{U}} {{U}} 8
{{/U}} {{/U}}taxes will benefit from the protection afforded.
It is no easy task to determine the social costs and social
benefits associated with a public good. There is no practicable way of{{U}}
{{U}} 9 {{/U}} {{/U}}drivers for 100 at highway signs, sailors for
watching a lighthouse, and citizens for the security provided to them through
national defense. {{U}} {{U}} 10 {{/U}} {{/U}}the market does
not provide the necessary signals, economic analysis has to be substituted for
the impersonal judgment of the market place.
【答案解析】[解析] B项enjoy意为“享有”。因下文为the benefits of these commodities，所以若选A项，则为have the benefits，“有……益处”。C项concern有一个固定短语：be concerned with sth．“关心，关注某事。”D项contribute“捐献，贡献。”
单选题
A. will reduce
B. will enhance
C. does not reduce
D. does not exclude
【正确答案】
C
【答案解析】[解析] does not reduce意为“不降低”。讲一般道理时用一般现在时。而且，据上下文意思“一个人利用这些公共商品不应降低其他人利用它们的可能性”来判断，C项才是正确答案。
单选题
A. as same as
B. as rare as
C. as far as
D. as good as
【正确答案】
B
【答案解析】[解析] 此句是要举例说明公共商品的享有。作者用not as rare as one might expect来表示有很多这类例子。