Answer:
1. Neck and Shoulder
2.arms and the back
3.A comfortable place to work
4.The study of people's efficiency in their working environment
5.A poor posture, Vibration, using too much force, frequent lifting
I think the answer is A. it doesn't make sense
I mean, not all do? But in Japan, looking nice is a (really) common thing. I assume they just take really good care of their hair though. And the black, could be natural or dyed.