题目

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, ________（50）, depends on its capacity(生产力) to produce wealth. 'Wealth ________（51）this sense is not money, for we do not live on money _______（52）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 ________（53） have an effect on one another. Wealth depends ________（54） a great extent如图，点A、B、C、D在同一直线上，AM=CN，BM=DN，∠M=∠N．请说明：（1）BM∥DN；（2）AC=BD．