So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of efforts as at the beginning. The brain is totally tireless. So what makes us tired?

　　Some scientists declare that most of our fatigue comes from our mental and emotional(情感的) attitudes. One of England's most outstanding scientists, J. A. Hadfield, says，“The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares，“One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems.”

　　What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated—those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

　　文章大意：最新的研究发现：持续的脑力劳动并不使人疲劳，真正使人疲劳的是一些精神上的消极情绪。

　　12．What surprised the scientists a few years ago?

　　A．Fatigue toxins could hardly be found in a laborer's blood.

　　B．Albert Einstein didn't feel worn out after a day's work.

　　C．The brain could work for many hours without fatigue.

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