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电焊机及其它焊割设备与高处焊割作业点的下部地面应保持5m以上距离。并设监护人。()

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多功能型团队也叫跨智能团队，由来自同一等级不同领域的员工组成，成员之间交流信息，激发新观点，减角面临的问题。()

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Which of the following is closest in meaning to "clogging up" (Para. 4)？

A. corrupting.
B. obstructing.
C. raining.
D. betraying.

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严禁将焊接电缆线或是焊割的橡胶管缠绕在身上操作，以防触电或燃爆。()

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By saying "... having subordinated the earth to man" (Para. 2), the author implies that science and technology _____.

A. have enslaved human beings
B. have led to the ruin of civilization
C. have freed human beings from ignorance
D. have helped human beings to conquer the Nature

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