A. All people do not respond to it in the same way
B. It causes hearing loss.
C. It is unwanted.
D. People become accustomed to it.
* Đáp án
A
* Hướng dẫn giải
Đáp án A Dẫn chứng: it is very difficult to measure because the discomfort experienced by different individuals is highly subjective and, therefore, variable.