A.A.LEFT("Visual FoxPro",6)与SUBSTR("Visual FoxPro",1,6)
B.B.RIGHT(DTOC(DATE()),2)与SUBSTR(DTOC(DATE()),7,2)
C.C.TYPE("36-5*4")与TYPE(36-5*4)
D.D.假定A="this",B="is a string",A-B与A+B
It can be inferred from Paragraph 4 that
A.Human behavior. is confined to the exclusive concern of psychologists.
B.Economists' utility is only the explanations for random acts of kindness.
C.Altruism is developed during the long process of human evolution.
D.Biologists can help economists explain some human behavior. deviations.