The word “accident”（Para. 2）can be best replaced by ________.
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1 .The standard 90db requires 16 quiet hours of rest each day for ____.
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2 .Ronald Reagan has to suffer permanent injury of hearing because some of the delicate hairs in his inner ear _______.
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3 .Scientists think that by the year 2000, _____.
A we wear contact lenses earlier. B people will have worse hearing C keep us from suffering more noises. D the ears to recover E have suffered a great damage F his nerve system is inefficient.
4 .We can keep our hearing health if ___________.
A we wear contact lenses earlier. B people will have worse hearing C keep us from suffering more noises. D the ears to recover E have suffered a great damage F his nerve system is inefficient.
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7 .X-rays can pass _____through materials that normally stop light.
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8 .What is the main idea of the passage?
A Roentgen discovered X-rays. B The usage of X-rays C An experiment made by Roentgen D The discovery of X-rays and its medical usage.
9 .The passage is mainly about ____________.
A how to deal with old age. B how to cultivate impersonal interests C how to get along with your children D how to deal with old people.
10 .The first paragraph of the passage suggests ________.
A modern society has made old people more fragile. B there is still much one can do in his old age. C in old age one should forget his past as capably as he can. D in old age one should switch his thoughts to the future.
