①the geographical location of the United States povides very good conditions for the country to grow and become strong.
②the United States has been blessed by being a land rich in mineral resources and fertile farm soil, together with a moderate climate.
③America has been fortunate in having enough people to provide the labour necessary for a constantly expanding economy.
④the quality of available labour. The United States has a skilful and willing labour force.
经济快速增长的几个因素：
1.美国的地理位置为国家的发展壮大提供了良好的条件;
2.美国有幸是一块矿产资源丰富、土壤肥沃的陆地，气候温和;
3.拥有足够的劳动力以满足不断发展的经济增长;
4.这些劳动力的质量。美国拥有技术高和能动性好的劳动力大军。
2)Characteristics of the U.S. economy:
characterised by a high degree of monopoly.
经济特征：已高度垄断为特点。
3)the importance of foreign trade:
the United States supplies a larger share of the imports of all other countries than does any other country in the world. But the U.S. share of the world trade has declined in recent years.
①Currently US exports are about 15% of the world's total;
②the US imports about 13% of all world imports;
③Canada is the largest single source of goods imported by the U.S., accounting for nearly 30% of the total. Asia provides about 18% of American imports. Thus the economy of these countries is often affected when the U.S. economy is in trouble.
美国进口的商品比世界任何国家都多。但最近几年比例有所下降。1.美国出口量占全世界出口总数的15%;2.美国的进口占13%左右;3.加拿大是最大的供应国，占总数的近30%。亚洲占18%左右。因此，一旦美国经济陷入困境，这些国家也会受到影响。
4)problems facing the US economy:
unemployment, inflation, financial deficit, and trade deficit.
经济存在的问题：失业，通货膨胀，财政赤字和贸易赤字。
