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  3. Read this memo about problems of noise levels in factories. Choose the best word to fill each gap. For each question (19—33) wri

Read this memo about problems of noise levels in factories. Choose the best word to fill each gap. For each question (19—33) wri

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问题 Read this memo about problems of noise levels in factories.
Choose the best word to fill each gap.
For each question (19—33) write one letter (A, B, C or D).

                                MEMO
From: Dr Chao Liang Luen, Chief Medical Officer
To: All Managers of the Dragon Company’s Branch Factories
Date: 29 November
    Loss of hearing among workers in our factories is how becoming a very serious problem of which all managers and supervisors must be aware. It is important to 0 workers whose hearing may have 19 because of unacceptable noise in certain 20 of a factory. Where there is very noisy machinery, supervisors usually 21 ear protectors to operatives and to those working nearby. However, not all workers are willing to wear ear protectors and often 22 instructions to do so. Others put them on but then 23 them unless they are 24 supervised. Appropriate, training and information about the 25 which can be caused by noise is probably the most effective way of dealing with this problem, provided that it is followed up by 26 vigilance.
    Sometimes the ear protectors worn by workers may be inadequate but may not cause any 27 loss of hearing. In such cases hearing difficulties will 28 so gradually that those affected may hardly be aware of them. In most cases, this kind of gradual deafness is 29 only when it is too late to 30 the situation in any way.
    Harder to recognize are noise 31 which do not cause deafness but which nevertheless 32 employees. It is therefore just as important that workers’complaints about such noise are fully 33 .
选项 A、constant
B、enduring
C、infinite
D、lasting
答案A
解析 constant连续不断的，持续的；enduring持久的；忍耐的；infinite无限的；无穷的；last—ing持久的，永久的，永恒的。constant常与vigilance搭配，意思是“经常的警戒”。
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