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.

　　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.

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

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

　　A．Challenging mental work.

　　B．Unpleasant emotions.

　　C．Endless tasks.

　　D．Physical labor.

　　What's the author's attitude towards the scientists' ideas?

　　A．He agrees with them.

　　B．He doubts them.

　　C．He argues against them.

　　D．He hesitates to accept them.

　　We can infer from the passage that in order to stay energetic, sitting workers need to _____.

　　A．have some good food

　　B．enjoy their work

　　C．exercise regularly

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