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Here is an astonishing and significant f...

Here is an astonishing and significant fact:Mental work alone can't make us tire. It sounds absurd. But a few 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 at 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 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.

1.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.

2.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.

3.What's the author's attitude towards the scientists' idea?

A. He agrees with them.

B. He doubts them.

C. He argues against them.

D. He hesitates to accept them.

 

1.C 2.B 3.A 【解析】 试题分析:本文主要叙述了科学家的新发现:人们感到疲惫是因为我们的不良情绪。 1. 2. 3. 【名师点睛】 本文第二段第一句If we took a drop of blood from a day laborer, we would find it full of fatigue toxins at and fatigue products.中含有条件句的虚拟语气。用法如下:如果过去事实相反,条件句中使用过去完成时,主句使用“情态动词+have done”;如果主句与现在事实相反,条件句中使用过去时,be动词使用were,主句中使用“情态动词+动词原形”;如果与将来事实相反,条件句中有三种:过去时;were to do ;should+动词原形,主句使用“情态动词+动词原形”;要特别注意如果省略了if,句子要使用部分倒装的形式,把助动词,be动词,情态动词提之主语前。 【10北京】--The weather has been very hot and dry. --Yes. If it had rained even a drop, things would be much better now! And my vegetables . A. wouldn't die B. didn't die C. hadn't died D. wouldn't have died 答案:D 考点:本题考查虚拟语气中对过去的虚拟。 解析:第二个说话人的If条件句是我们选择正确答案的关键。要是当时下雨了, 现在的情况就好的多了!我的蔬菜也就不会死了。过去没有下雨, 所以我的蔬菜干死了也是发生在过去。而将句子还原则为If it had rained even a drop, my vegetables wouldn't have died.结构为:If+ had done, 主句为couldn’t/ shouldn't/ wouldn't have done. 考点:考查科普类阅读
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