We can keep our hearing health if ___________.
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1 .Paragraph 2 _____ .
A More decibels the noise has, more harmful to ears. B We’ll be deaf if the noise is at 140db. C Weaker hearing is less related with aging. D You’ll lose hearing when you die. E The standard for suffering noise is out of reality. F Noise is hurting young people.
2 .Paragraph 4 _____.
A More decibels the noise has, more harmful to ears. B We’ll be deaf if the noise is at 140db. C Weaker hearing is less related with aging. D You’ll lose hearing when you die. E The standard for suffering noise is out of reality. F Noise is hurting young people.
3 .The standard 90db requires 16 quiet hours of rest each day for ____.
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 .Ronald Reagan has to suffer permanent injury of hearing because some of the delicate hairs in his inner ear _______.
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.
5 .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.
7 .According to the last two paragraphs, Sindler believes that
A calorie restriction is very important to young people B seeing the effect of a diet, people will eat less than normal. C dieting is not a good method to give us health and a long life. D drugs do not have the effects of calorie restriction.
8 .The word “accident”（Para. 2）can be best replaced by ________.
A Because the light was on. B Because it was very bright. C Because it was barium compound D Because of X-rays.
9 .X-rays can pass _____through materials that normally stop light.
A by B through C with D along
10 .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.
