阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。 Ron was an engineer. He planned a change and tried the new job of teaching kids how to swim. Ron′s easy manner soon made him a full-time employee at the swim school. Now, the 40 hours he works a week takes in weekends, early mornings and late afternoons. He earns around 25% less than he did in engineering. But, at 49, he says he has never been happier. "I′ve had a drop in pay, but I′ve cut back on spending, too. I seldom drive to work so don′t have to pay as much for petrol (汽油). I don′t drink as much. I go walking in my lunch break and I′ve lost 20 kilos. I love going to work. The whole family is a lot happier." When one of his brothers called, offering to help him find "a real job", he answered, "I don′t care. I know what I′m doing is good." He admits it was fearful making such a big change when there was the mortgage (分期付款) to pay and kids to clothe and feed, but in the end he feels it is a simple choice. "If you′re in a job you don′t like, get out. Money′s not everything. If you don′t like it, change—find something you′re going to be happy with."