C.Much of the food American teenagers eat today harms their hearing.
D.Hearing loss has something to do with someone’s race.
解析:选A。推理判断题。根据第三段的The researchers say they are not sure why some teenagers are losing their hearing...可知听力下降的具体原因还不知道。
38.Researchers suggest that parents________.
A.pay more attention to their children’s diets
B.not let their children listen to music for a long time
C.help their children set the volume control to the proper level
D.keep a close eye on what kind of music their children listen to
解析:选C。细节理解题。根据第四段的Researchers suggest parents stand next to their children while they are wearing earphones.可知研究人员建议父母帮助孩子控制好音量。
39.The last paragraph suggests that hearing loss________.
A.has attracted worldwide attention
B.will be well prevented in the future
C.has worried most parents in America
D.may not be good for one’s future development
解析:选D。细节理解题。根据末段的Even a small hearing loss can affect a child’s social development.可知听力下降可能对一个人的未来发展不利。
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