问题：
[问答题]Passage 2 Public goods are those commodities from whose enjoyment nobody can be 1 excluded. Everybody is free to 2 the benefits of these commodities, and one person’s utilization 3 the possibilities of 4 enjoying 5 . Examples of public goods are not 6 one might expect. A flood control dam is public goods. Once the dam is built, 7 living in the area will benefit 8 their own contribution 9 the construction cost of the dam. The same 10 true for highway signs or aids to navigations. Once a 1ighthouse is built, 11 _ ship of 12 nationality can be effectively excluded from the13the lighthouse for navigational purposes. National defense is another example. 14 a person who voted against military expenditures or 15 taxes 16 the protection afforded. It is no easy task to17the social costs and social benefits associated with a public good. There is 18 way of 19 drivers for 100 at highway signs, sailors for watching a lighthouse, and citizens for the security provided to them through national defense. 20 the market does not provide the necessary signals, economic analysis has to be substituted for the impersonal judgment of the market place.1. A. efficiently B. effectively C. effectually D. absolutely2. A. have B. enjoy C. concern D. contribute3. A. will reduce B. will enhance C. does not reduce D. does not exclude4. A. anybody’s B. somebody else’s C. anybody else’s D. whoever5. A. the benefit goods B. the peculiar goods C. the same goods D. his goods6. A. as same as B. as rare as C. as far as D. as good as7. A. some people B. the native people C. all the people D. the common people8. A. regarding B. irrespective of C. by virtue of D. considering9. A. for B. on C. towards D. to10. A. holds B. has C. grasps D. carries11. A. any B. a C. the D. no12. A. any B. a C. some D. no13. A. enjoying B. sharing C. catching sight of D. utilization of14. A. If B. When C. Once D. Even15. A. has paid B. has not paid C. paid D. did not pay16. A. could benefit from B. will benefit from C. couldn’t benefit from D. won’t benefit from17. A. calculate B. collect C. determine D. investigate18. A. an advisable B. a practicable C. no advisable D. no practicable19. A. charging B. estimating C. calculating D. controlling20. A. Because B. Even C. However D. Surprisingly
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