Hearing loss is very common in the elderly,Grimes said,but she added that it was concerning to see it come into the younger age groups.In babies and young children,hearing problems are known to delay language development,which in turn influences performance in other areas.Slight hearing loss,for instance,makes it difficult to distinguish between high-frequency consonants like “s” and “f”
__③__The science is less clear for adolescents,but it is easy to imagine how being hard of hearing could influence learning,said Grimes.“We know from a lot of data that noisy classrooms are one of the biggest challenges to learning.”
The reasons for the rise are still uncertain.When asked about noise exposure—on the job,from firearms or recreational activities,for instance—the teenagers didn’t indicate any change.But Shargorodsky said,“We knew from before that it is difficult to ask this age group about noise exposure—they underestimate it.”__④__Although it’s not clear that these devices are to blame,Grimes said it was still a good idea to turn down the volume.But she pointed out the advice would likely fall on deaf ears.She said the American Academy of Hearing had also contacted Steve Jobs,the CEO of Apple,about adding a volume limiter on iPods,but never heard back.
57.In which place should the sentence “Few people would call it noise when they listen to music on their MP3 players,for instance.” be put?
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