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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The 811 billion self-help industry is built on the idea that you should turn negative thoughts like 'I never do anything right' into positive ones like 'I can succeed.' But was positive thinking advoc...
A.
It is a highly profitable industry.
B.
It is based on the concept of positive thinking.
C.
It was established by Norman Vincent Peale.
D.
It has yielded positive results.