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【C18】
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A well-documented body of information exists. It shows that noise can【C1】______humans in both physiological and psychological ways. Hearing losses in【C2】______occupations such as boiler-making and construction work are well known. In fact,【C3】______, we all find hearing more difficult as we【C4】______. Young ears can distinguish a wide【C5】______of sounds from low to very high frequencies,【C6】______older ears lose the ability to distinguish high-pitched sounds. A comparison of some【C7】______versus (与......相对) non-industrialized peoples suggests that this heating loss may not be the must-be result of old age.【C8】______,.a closer examination of other data reveals【C9】______effects. For instance, airports are currently operating at【C10】______capacity because of noise regulations which【C11】______their hours of operation. Job performance call be seriously affected by loud noise, especially if accuracy and【C12】______effort are involved. The Use of outdoor areas for conversation is not possible for an【C13】______5 to 10 million people who live or work in urban areas. When【C14】______with television or speech or sleep is【C15】______, as many as 22 to 44 million people can be said to have【C16】______part of the use of their homes and grounds because of noise.【C17】______noise pollution is a serious environmental【C18】______.
Much more【C19】______should be made to warn people【C20】______the grave effects which may stem from an excessively noisy environment.
【C1】
【C9】
Are you aware that you actually possess six senses？ The sixth sense is a muscular sense responsible for directing your muscles intelligently--to the exact extent necessary for each action you perform. For example, when you reach for an object, the sensory nerves linking the muscles to the brain stop your muscles in relation to the object is your muscular sense in action.
Muscles are stringy bundles of fibers varying from one five-thousandth of an inch to about three inches. They have three unique characteristics: they can become shorter and thicker and can stretch to their original position. Under a high-powered microscope, muscle tissue is seen as long, slender cells with a grainy texture like wood.
More than half of a person's body is composed of muscle fibers, most of which involuntary --in other words, work without conscious direction. The voluntary muscles, those that we move consciously to perform. particular action, number more than five hundred. Women have only 60 to 70 percent as muscle as men for their body mass. That is why an average woman can't lift as much, throw as far, or hit as hard as an average man.
Intelligent use of the muscles means that ______.
【C20】
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