单项选择题
A.Many of them found it difficult to exercise on a plane. B.Many of them were concerned with their well-being. C.Not many of them chose to do what she did. D.Not many of them understood the program.
A.Study for some profession. B.Attend a medical school. C.Stay in business. D.Sell his shop.
A.To combat competition and raise productivity. B.To provide them with more job opportunities. C.To help them maintain their living standard. D.To prevent them from holding a second job.