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  3. The steady hum of school heating systems and air-conditioners can mean lower test scores for many young students, found a new st

The steady hum of school heating systems and air-conditioners can mean lower test scores for many young students, found a new st

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问题     The steady hum of school heating systems and air-conditioners can mean lower test scores for many young students, found a new study. The finding adds to growing evidence that classroom noises【C1】______ with learning.
    Plenty of studies have demonstrated the distracting【C2】______of noise in the classroom. In louder rooms, kids have more trouble hearing the teacher and become easily distracted,【C3】______when they are reading to themselves. Schools【C4】______ airports also report lower test scores than schools that are not affected by airplane noise. In one study, German students started scoring better on reading and vocabulary tests after a nearby airport【C5】______.
    Researchers were also interested in less【C6】______ sounds like the general buzz of basic mechanical systems. It was【C7】______that kids who spent all day in classrooms with such noises【C8】______ to score lower on standard reading comprehension tests. But math scores didn’t【C9】______ with noise levels, possibly because teachers use more【C10】______ when they’re teaching math than when they’re teaching words.
  【C11】______, lots of background noise sets kids up for problems. Studies have shown that kids make more noise in louder rooms.【C12】______by the scraping of chairs, the hum of the heating system,【C13】______the voices of other kids competing to be heard, some students【C14】______have a particularly hard time hearing【C15】______ the teacher is saying. And it’s not that they’re lazy or using noise as an【C16】______. Young brains have a much harder time【C17】______a signal from the background than mature, adult brains do.
    Along with【C18】______work, the new findings suggest the【C19】______ for enforcement of ANSI’s standards. Despite an endless list of budgetary【C20】______, schools might have to put quiet at the top of their to-do lists.
【C7】
选项 A、expected
B、considered
C、suggested
D、revealed
答案D
解析 动词辨析题。句意为：研究显示，整天在充斥着此类噪音的教室中度过的孩子在标准化的阅读理解考试中成绩往往较低。本题所在句为主语从句，it为形式主语，真正的主语是that引导的从句。很明显，从句内容为研究发现，因此用reveal“揭示”。expect“预期”、consider“考虑”和suggest“建议”，均不适合用来表达研究发现，排除。
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