阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡并在答题卡上将该项涂黑。
A
My son Paul got a job in a guitar store．It was the first time for him to do such a job．The pay was based on a small salary and his sales．They offered him some training on how to approach a customer, introduce a product and make the sale．However, he wasn't doing well．He was very puzzled．
One morning, Paul said to me, " Mom, you used to be a sales trainer．Can you tell me why I 'm not doing well?" I said, "The key is that you must love the people you are selling a product to．Never count the money you will make in your mind．Do what is best for them even though they are just
