So far as the brain is concerned，it can work as well and swiftly at the end of eight or even twelve hours of effort 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 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 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.

　　25. 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 after a day’s work.

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

　　D. A mental worker's blood was filled with fatigue toxins.

　　26. According to the author, which of the following can make sitting workers tired?

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