阅读下段文字，完成文后题目。

       勇气是逆境当中绽放的光芒，它是一笔财富，拥有了勇气，就拥有了改变的机会。岳飞的“三十功名尘与土”，文天祥的“留取丹心照汗清”；贝多芬的 è住命运的咽喉，海伦·凯勒的假如给我三天光明；这些勇气都彪炳在史册上，流传在故事里；勇气有时候是一shùn间的闪念，有时候是一辈子的执念。莎士比亚说，有得必有勇，正直的人不会胆怯，试想一下，如果历史失去了勇气那将失去改写的英雄；如果人生失去了勇气，那很多日子就会变得苍白无力。（《朗读者》第八期 有删改）

阅读下段文字，完成文后题目。

       勇气是逆境当中绽放的光芒，它是一笔财富，拥有了勇气，就拥有了改变的机会。岳飞的“三十功名尘与土”，文天祥的“留取丹心照汗清”；贝多芬的 è住命运的咽喉，海伦·凯勒的假如给我三天光明；这些勇气都彪炳在史册上，流传在故事里；勇气有时候是一shùn间的闪念，有时候是一辈子的执念。莎士比亚说，有得必有勇，正直的人不会胆怯，试想一下，如果历史失去了勇气那将失去改写的英雄；如果人生失去了勇气，那很多日子就会变得苍白无力。（《朗读者》第八期 有删改）

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    Here is an astonishing and significant fact: Mental work alone can't make us tire. It sounds absurd. But a years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue (疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    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(情绪的) 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 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.