问题补充：
Millions of youngsters across Europe could suffer hearing loss after five years if they listen to MP3 players at too high a volume for more than five hours a week, EU scientists warned.
A. temporary
B. permanent
C. frequent
D. extraordinary
答案：
A. temporary
(答案→)B. permanent
C. frequent
D. extraordinary
解析：词义辨析。A. 临时的 B. 永久的 C. 频繁的 D.非凡的。句意：欧盟科学家警告说，欧洲数以百万计的年轻人可能五年后可能要遭受永久的听力损失，如果……，结合语境可知选B为最佳答案.
