单选题 New employees of Ace Industries are complaining about discomfort caused by excessive noise inside Ace's factory. Experienced Ace factory employees, however, do not suffer any such discomfort. Although Ace accepts responsibility for the health of its employees, it has decided not to issue earplugs to new employees. Ace reasoned that the new employees would also become accustomed to the noise without using earplugs.
Which of the following, if true, indicates a flaw in Ace's decision not to issue earplugs to new employees?

A、 Because the noise in Ace's factory is absorbed by soundproof walls, it cannot be heard by Ace executives in their offices.
B、 Many of the new employees interviewed said they would not wear earplugs on the job.
C、 Issuing earplugs to all new employees would be a less effective method of reducing employees' exposure to noise than altering the machinery to be less noisy would be.
D、 The experienced employees' lack of discomfort is attributable to hearing loss caused by the factory noise.
E、 (E) The machines in Ace's factory have not become any noisier since the experienced workers were originally hired.

【正确答案】 D

【答案解析】