单选题：A Country's Standard of Living　　The "standard of living" of

　　A Country's Standard of Living　　The "standard of living" of any country means the average person's share of the goods and services the country produces. A country's standard of living, （51）,depends on its capacity to produce wealth. "Wealth"______________（52） this sense is not money, for we do not live on money______________（53） on things that money can buy:"goods" such as food and clothing, and "services" such as transport and entertainment.
　　A country's capacity to produce wealth depends upon many factors, most of______________（54） have an effect on one another. Wealth depends______________（55） a great extent upon a country's natural resources. Some regions of the world are well supplied with coal and minerals, and have fertile （肥沃的） soil and a favorable climate;other regions possess none of them.
　　Next to natural resources______________（56） the ability to turn them to use.China is perhaps as well-off （57） the USA in natural resources, but suffered for many years from civil and external wars, and______________（58） this and other reasons was______________（59） to develop her resources. Sound and stable political conditions, and______________（60） from foreign invasions, enable a country to develop its natural resources peacefully and steadily, and to produce more wealth than another country equally well favoured by nature but less well ordered.
　　A country's standard of living does not only depend upon the wealth that is produced and consumed （61） its own borders, but also upon what is directly PrOduced through international trade.______________（62）,Britain's wealth in foodstuffs and other agricultural products would be much less if she had to depend only on______________（63）grown at home. Trade makes it possible for her surplus （过剩的） manufactured goods to be traded abroad for the agricultural products that would______________（64） be lacking. A country's wealth is, therefore, much______________（65） by its manufacturing capacity,provided （如果） that other countries can be found ready to accept its manufactures. A．however
B．furthermore
C．similarly
D．therefore