A.Aged People Learn Better than Young People
B.Young People Learn Better than AgedPeople
C.It Is Never Too Late to Learn
D.The Brain Shows Adult People's Desire to Learn
A.move to another place
B.be happy
C.change one' s job
D.be promoted
A.improving their job skills
B.economic necessity
C.improving their health
D.their love of learning
A.Several worldwide economic problems.
B.The causes and consequences of tradedeficit.
C.Lack of resources in underdevelopedcountries.
D.The value of exports against imports.