单选题
What conclusion can be logically drawn from the selection?
A、
Only poorly educated people seek the advice of quacks.
B、
Quacks are motivated by the desire to help mankind.
C、
A person's brain can not control the body's pain-tolerance level.
D、
The human brain is a powerful and mysterious organ.
【正确答案】
D
【答案解析】
文中“mind over matter”意为“精神作用”，是本文的主题。在全篇均可看到精神作用对疾病的恢复起到了一定的作用，故D为正确答案。
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