2017届高考北师大版英语二轮复习单元限时规范练：选修7 Unit 20《new frontiers》（含解析）_高考复习指南

　　5．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.

　　答案：C　细节理解题。根据第一段“To the amazement of these scientists, they discovered that...when it is active, shows no fatigue at all！”可知。

　　6．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。根据第三段“Some scientists declare that most of our fatigue comes from our mental and emotional attitudes.”以及最后一段可知。

　　7．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.

　　答案：A　推理判断题。根据最后一段，并结合第三段内容，可知作者与科学家的观点一致。

　　8．We can infer from the passage that in order to stay energetic, sitting workers need to

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