The four problems that face the economy of the United States are ______.
A、unemployment, inflation, financial crisis and trade deficit
B、unemployment, inflation, financial deficit and trade deficit
C、mortgage losses, inflation, financial deficit and trade deficit
D、unemployment, market failures, financial deficit and trade deficit
【正确答案】：B
【题目解析】：美国经济面临的四个问题是失业、通货膨胀、财政赤字和贸易赤字。
