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利息备付率和偿债备付率是评价投资项目偿债能力的重要指标，对于正常经营的企业，利息备付率和偿债备付率应（）。
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Charter Schools
American public education has changed in recent years. One change is that increasing numbers of American parents and teachers are starting independent public schools______（51） charter schools （特许学校）.
In 1991, there were no charter schools in the United States. Today, more than 2,300 charter schools______（52） in 34 states and the District, of Columbia. 575,000 students______（53） these schools. The studentsarefrom 5 years of age through 18 or older.
A charter school is______（54） by groups of parents, teachers and community （社区） members. It is similar in some ways______（55） a traditional public school. It receives tax money to operate just as other public schools do. The______（56） it receives depends on the number of students. The charter,school must prOVer to local or state governments that its students are learning. These governments______（57） the school with the agreement, or charter that permits it to operate. Unlike a traditional public school______（58）, the charter school does not have to obey most laws governing public schools. Local, state or federal governments cannot tell it what to______（59）.
Each school can choose its own goals and decide the ways it wants to______（60） those goals. Class sizes usually are smaller than in many traditional public schools. Many students and parents say______（61） in charter schools can be more creative.
However, state education agencies, local education-governing committees and unions often______（62） charter schools. They say these schools may receive money badly______（63） by traditional public schools.Experts say some charter schools are doing well while others are struggling.
Congress provided 200 million dollars for______（64） charter schools in the 2002 federal budget （预算）.But, often the schools say they lack enough money for their______（65）. Many also lack needed space.
第 51 题
Preserving Nature for Future
Demands for stronger protection for wildlife in Britain sometimes hide the fact that similar needs are felt in the rest of Europe. Studies by the Council of Europe, of which 21 countries are members, have shown that 45 per cent of reptile （爬行动物） species and 24percent of butterflies （蝴蝶） are in danger of dying out.
European concern for wildlife was outlined by Dr Peter Baum, an expert in the environment and natural resources division of the council, when he spoke at a conference arranged by the administrators of a British national park. The park is one of the few areas in Europe to hold the council's diploma （证书） for nature reserves （自然保护区） of the highest quality, and Dr Baum had come to present it to the park once again.He was afraid that public opinion was turning against national parks, and that those set up in the 1960s and 1970s could not be set up today. But Dr Baum clearly remained a strong supporter of the view that natural environments needed to be allowed to survive in peace in their own right.
"No area could be expected to survive both as a true nature reserve and as a tourist attraction," he went on. The short-sighted view that reserves had to serve immediate
human demands for outdoor recreation （户外娱乐） should be replaced by full acceptance of their importance as places to preserve nature for the future.
"We forget that they are the guarantee of life systems, on which any built-up area ultimately depends," Dr Baum went on. "We could manage without most industrial products, but we could not manage without nature. However, our natural environment areas, which are the original parts of our countryside, have shrunk （缩小） to become mere islands in a spoiled and highly polluted land mass."
第 31 题 Recent studies by the Council of Europe have indicated that.
按照政府职能可以将公共支出分为（）等项目。
(2010年真题)下列关于项目经济评价指标的说法，正确的是（）。
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