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The choice of tools was also found to affect the quantities of asbestos particles that enter the air. Machine tools produce greater quantities of dust than hand tools and, where possible, the use of the latter was recommended. 

A critical factor which takes place in risk reduction is the adequate ventilation of the working environment. When work takes place in an enclosed space, more asbestos particles circulate and it was therefore recommended that natural or machine ventilation should be used. By closely following these advice, it was claimed that exposure can be reduced to a reasonably practical minimum . 

36. Exposure to asbestos fibres can cause cancer _______. 

A. only when asbestos is used in building industry. 

B. only when it is used in large quantities. 

C. even if it is used in small quantities. 

D. if they are used when wet rather than dry. 

37. Exposure to asbestos fibres is harmful to people’s health 

A. so the use of asbestos is limited. 

B. but asbestos will continue to be used for a long time to come. 

C. so other new kinds of materials are under development. 

D. but the)’ will not be so when ventilation devices are used 

38. It can be inferred from the passage that the real danger comes from _______. 

A. the 3sbestos dust that people take in 

B. the contact of the worker’s skin with asbestos particles 

C. the inferior quality of the asbestos itself 

D. the excessive use of man-made asbestos material 

39. Evidence from the economists and the building industries shows that _______. 

A. exposure to asbestos fibres is cancer causing 

B. asbestos is in extensive use in building industry 

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