D．lactic acid is produced in muscles during exercise

　　答案：D　推理判断题。由第三段第二句话“Lactic acid is a by­product of exercise, and the increase of it is often mentioned as a cause of tiredness.”可知。

　　35．What is Paragraph 3 mainly about?

　　A．The description of a new test.

　　B．The explanation of the theory.

　　C．The whole process of the research.

　　D．The puzzling evidence of a study.

　　答案：D　推理判断题。第二段结尾提到“it does explain many puzzling aspects of athletic performance.(新理论解释了运动员表现的一些令人费解的方面)”，第三段承接上文，详细谈论了这些令人费解的方面。

　　第二节　(共5小题；每小题2分，满分10分)

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　(2016·山西大学附中模块诊断)

　　The iPod generation

　　Today it is common to see people who walk about with colored wires hanging from their ears wherever they go.They move about in their personal bubbles, sometimes unaware of what's happening around them.__36__ Outside life is shut out.So are you one of “them”？

　　For me, walking around in my own personal bubble is perfect. __37__ What's even better, wearing earphones seems to give a signal to people which says: “I'm not available for chatting at the moment！”

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