This course focuses on the ______ of economic analysis to the problems of inflation, unemployment, the balance of payments and enterprise behavior.

单项选择题His total worldly possessions ______ little more than the clothes he stood up in.

单项选择题As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the ______ donor.