18.As many as one in five US teenagers have some degree of hearing loss,according to researchers.
They say the problem is growing.
Teenagers really don't pay attention to how much noise they are exposed (暴露) to,Josef Shargorodsky of Brigham and Women's Hospital in Boston told Reuters."Often people won't notice it,but even slight hearing loss may affect language development,"said Shargorodsky,one of the researchers.
The study compared surveys from the early 1990s and the mid-2000s.Each included a few thousand teenagers.In the first survey,about 15percent of teenagers had some degree of hearing loss.Some 15years later,that number had risen by a third,to nearly 20percent.
"This certainly is big news,"said Alison Grimes,an ear doctor.Hearing loss is very common in old people,Grimes said,but she added that it was worrying to see it happen in the younger age group.
In babies and young children,hearing problems are known to slow language development.The science is less clear for teenagers,but it is easy to imagine how being hard of hearing could affect learning,said Grimes,.
The reasons for the rise are still unclear.When researchers asked teenagers about noise exposure-on the job,at school or from activities,for example-the teenagers didn't report any change.But Shargorodsky said that might not be true."We knew from before that it is difficult to ask this age group about noise exposure-they underestimate (低估) it."Few people would call it noise when they listen to music on their MP3player,for example."There is a difference between what we think is loud and what is harmful to the ear,"said Grimes.
Although it's not clear that the MP3 players cause teenagers'hearing loss,Grimes said it was still a good idea to turn down the sound and take short breaks from listening.
29.According to the researchers,in a US class of 40students,aboutD students have some degree of hearing loss.
A.one B.five C.six D.eight
30.Which of the following statements is true according to the article?C
A.Slight hearing loss does not influence learning.
B.Only a few old people have hearing problems.
C.Hearing problems can slow language development.
D.Noise exposure is clearly noticed by teenagers.
31.About hearing loss,it can be inferred thatC.
A.the reasons for the rise have been found B.MP3players are to blame
C.listening to loud music may be a cause D.noise is the main reason
32.The article was written toA.
A.warn teenagers that loud music might be harmful
B.explain what kinds of noises might affect studies
C.suggest that teenagers shouldn't listen to loud music
D.show how important hearing can be for learning.
分析 本文主要講述噪音對孩子們的聽力問題的影響的研究,并警告孩子們嘈雜的音樂對聽覺有損傷進而影響了學(xué)習(xí).
解答 29.D 數(shù)字計算題 根據(jù)In the first survey,about 15percent of teenagers had some degree of hearing loss.Some 15years later,that number had risen by a third,to nearly 20percent.可知,40名學(xué)生中有百分之20的聽覺有問題,可知人數(shù)是8人,故答案為D
30.C 細節(jié)理解題 根據(jù)In babies and young children,hearing problems are known to slow language development.可知,聽覺問題會影響學(xué)生語言的學(xué)習(xí)能力,故答案為C
31.C 推理判斷題 根據(jù)Although it's not clear that the MP3 players cause teenagers'hearing loss,Grimes said it was still a good idea to turn down the sound and take short breaks from listening.可知大的音樂可能對聽覺有害,故答案為C
32.A 主旨大意題 本文主要講述噪音對孩子們的聽力問題的影響的研究,并警告孩子們嘈雜的音樂對聽覺有損傷進而影響了學(xué)習(xí),故答案為A
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