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. |
A.Challenging mental work. | B.Unpleasant emotions. |
C.Endless tasks. | D.Physical labor. |
A.He agrees with them. | B.He doubts them. |
C.He argues against them. | D.He hesitates to accept them. |
A.have some good food. | B.enjoy their work |
C.exercise regularly | D.discover fatigue toxins |
試題分析:本文是一篇說明文,科學(xué)家們發(fā)現(xiàn)腦力勞動不能使人勞累,使人勞累的是人的精神和情感狀態(tài),即厭煩、生氣、焦急、緊張、憂慮以及不被欣賞等。因而在體內(nèi)產(chǎn)生緊張感,因而覺得身體累了。
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