D.A mental worker's blood was filled with fatigue toxins.
答案:C 细节理解题。从第一段的To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all!可知答案。
13.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.
答案:B 细节理解题。从第三段的One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems.可知答案。
14.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.
答案:A 推理判断题。从文章的最后一段的We get tired because our emotions produce nervousness in the body可知,作者同意科学家的观点。
15.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
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