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 ______ do- nor.

A．common
B．universal
C．general
D．popular
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单项选择题
Blair tends to feel useless and unwanted in a society that gives so much ______ to those who compete well.
A．superiority
B．regime
C．prestige
D．legislation
单项选择题
This course focuses on the ______ of economic analysis to the problems of inflation, unemployment, the balance of payments and enterprise behavior.
A．introduction
B．combination
C．application
D．conception
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