单项选择题

A．Telephones.
B．CD players.
C．Video camera recorders.
D．Home computers.
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单项选择题
Once people have enough income for comfortable life, then more income provides diminishing returns.
A．Y
B．N
C．NG
单项选择题
A．Self-improvement, A Search for Physical Fitness.B．Different Forms of Self-improvement in America.C．Self-improvement, A Good Way to Spend Leisure Time.D．Adult Education and Self-improvement.
A．Self-improvement, A Search for Physical Fitness.
B．Different Forms of Self-improvement in America.
C．Self-improvement, A Good Way to Spend Leisure Time.
D．Adult Education and Self-improvement.
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