2. 外语
  3. Noise constitutes a real and present danger to people’s health. Day and night, at home, at work, and at play, noise can produce

Noise constitutes a real and present danger to people’s health. Day and night, at home, at work, and at play, noise can produce

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问题     Noise constitutes a real and present danger to people’s health. Day and night, at home, at work, and at play, noise can produce serious【C1】______ and psychological stress. No one is【C2】______  to this stress. Though we seem to 【C3】______ to noise by ignoring it, the ear, in fact, never closes and the body still【C4】______ sometimes with extreme tension--to a strange sound in the night.
    The【C5】______ we feel when faced with noise is the most common outward【C6】______ of the stress building up inside us. The more【C7】______ and more serious health hazards【C8】______ with the stress caused by noise traditionally hay been given much【C9】______ attention.【C10】______ , when we are annoyed or made irritable by noise, we should consider, these symptoms fair warning【C11】______ other things may be happening to us, some of which may be damaging our health.
   【C12】______  many health hazards of noise, hearing loss is the most clearly【C13】______ and measurable by heal professionals. The other hazards are harder to【C14】______ . For many of us, there may be a risk that  【C15】______ to the stress of noise increases susceptibility to disease and infection. The more【C16】______ among us may experience noise a【C17】______  factor in heart problems and other diseases. Noise that causes annoyance and irritability in health persons may have more serious consequences for those already ill in mind or body.【C18】______ , the link between noise and many disabilities or diseases has not yet been【C19】______ demonstrated, and we【C20】______ to dismiss annoyance caused by noise as a price to pay for living in the modem world.  
【C11】
选项 A、when
B、that
C、if
D、\
答案B
解析 结构辨别题。本题考查句子结构。空白处后面的分句作warning的同位语，是同位语从句，由that
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