Mere is an astonishing and significant fact: Mental work alone can’t make us tired. 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 (疲勞).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.

64. 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.

65. 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.

66. 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.

67. 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

D.       discover fatigue toxins

【語(yǔ)篇解讀】本文是一篇說(shuō)明文�？茖W(xué)家們發(fā)現(xiàn)腦力勞動(dòng)并不能使人感到勞累，使人感到累的是人的精神與情感狀態(tài)，即：厭煩、生氣、焦急、緊張、憂慮以及不被欣賞。

段落

關(guān)鍵詞、句

大意推測(cè)

第一部分（Para. 1）

an astonishing and significant fact；Mental work alone can’t make us tired；sounds absurd

腦力勞動(dòng)不會(huì)使人勞累：一個(gè)令人驚訝又有意義的事實(shí)；腦力勞動(dòng)不會(huì)使人覺(jué)得勞累；聽(tīng)起來(lái)很荒唐

第二部分（Para. 2-4）

our mental and emotional attitudes；A feeling of being bored， anger, anxiety, tenseness, worry, a feeling of not being appreciated；produce nervousness in the body.

使人產(chǎn)生勞累的因素：

我們的精神和情感態(tài)度；一種厭煩、憤怒、焦急、緊張、憂慮、不被欣賞的感覺(jué)；在體內(nèi)產(chǎn)生緊張感

【解析】

64.C。細(xì)節(jié)推理題。難度：較易。找到關(guān)鍵詞surprise，定位第一段。根據(jù)Mere is an astonishing and significant fact: Mental work alone can’t make us tired. It sounds absurd.（Mere是一個(gè)令人驚訝又有意義的事實(shí)：僅僅腦力勞動(dòng)不能使我們覺(jué)得累。這聽(tīng)起來(lái)有點(diǎn)荒唐）。鎖定答案C。

65.B。細(xì)節(jié)判斷題。難度：較易。找到關(guān)鍵詞句can make sitting workers tired，定位末段。根據(jù)A feeling of being bored， anger, anxiety, tenseness, worry, a feeling of not being appreciated - those are the emotions that tire sitting workers（一種厭煩、憤怒、焦急、緊張、憂慮、不被欣賞的感覺(jué)，這些是使腦力工作者感到累的情感因素）。因此，答案為B。

66．A。態(tài)度判斷題。難度：較難。這是一篇說(shuō)明文，文章的主旨或者作者的態(tài)度一般在首末段體現(xiàn)。文章的首段首句Mere is an astonishing and significant fact（Mere是一個(gè)令人驚訝又有意義的事實(shí)），作者的態(tài)度是驚嘆與贊同的；在末段，作者得出結(jié)論：We get tired because our emotions produce nervousness in the body.（我覺(jué)得累是因?yàn)槲覀兊母星樵隗w內(nèi)產(chǎn)生了緊張情緒）。因此，可以斷定作者的態(tài)度是贊同的，而不是懷疑、爭(zhēng)論或者猶豫。

解題思路：判斷一個(gè)人的態(tài)度或者性格，一定要關(guān)注文章中描繪它的形容詞和動(dòng)詞等。如文中的significant;declare;goes even further等。

67.B。推理判斷題。難度：較難。通過(guò)文章的大意結(jié)構(gòu)圖，我們知道在文中的第二三四段作者給我們分析了科學(xué)家對(duì)致使我們勞累的因素進(jìn)行的研究，在文中的末端得出了結(jié)論:不好的情緒致使體內(nèi)產(chǎn)生緊張情愫從而使人覺(jué)得勞累。因此答案為選項(xiàng)B。enjoy their work（享受工作）。

【長(zhǎng)難句學(xué)習(xí)】

 If we took a drop of blood from a day laborer, we would find it full of fatigue toxins (毒素）and fatigue products.

翻譯：如果從一個(gè)做散工的人身上取一滴血，我們會(huì)發(fā)現(xiàn)它充滿了疲憊因素和疲憊產(chǎn)物。

分析：句子的主句是we would find it full of fatigue toxins (毒素）and fatigue products.

full of短語(yǔ)做it的賓語(yǔ)補(bǔ)足語(yǔ)；if引導(dǎo)的從句為條件狀語(yǔ)從句。

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