In 1989, fresh out of high school, I had the difficult task of choosing a career path before college started in three months. In those days in Pakistan, there were limited options (选择): becoming a doctor or an engineer, or entering the financial world after getting a business degree. I wasn't interested in engineering, so that I was left with medicine or business. I couldn't decide.

    My uncle, one of the ciders in the family, suggested that I do a work placement to experience it for a month in an international company followed by a month in a hospital. After that, I could make a decision. It seemed like a brilliant idea.

    I was accepted for a month's placement at a foreign bank in Karachi. I got a feel for how the world of finance functioned, made new friends, and generally enjoyed the mostly easy-going work surroundings.

    The month passed rapidly, and soon I began working at a leading hospital in Karachi. The experience couldn't have been more different. The hospital had an intense (紧张的) environment. The days started early (at 7 am, compared to 9 am at the bank), and were filled with endless duties. And the night calls! This was crazy, working all day, through the night, and again the next day.

    I began thinking about my two experiences. The bank had offered a more relaxing atmosphere, better working hours and less stress. The hospital was full of excitement and unpredictability, but the studying and training was difficult. It seemed that the business option was going to win out.

    Near the end of my month at the hospital, I was driving home after an especially busy night call. In front of me was a public bus, with college students sitting on the top. As the driver weaved through (穿梭) traffic, I could see the boys shaking from side to side.

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Paragraph 1: Suddenly, a boy fell off the back of the bus.        ▲              .

Paragraph 2: The next day, when I went to hospital to see the boy, all his family got up, with grateful smiles on their faces.            ▲                   .

根据短文理解，选择正确答案。

    Many years ago，when I was fresh out of school and working in Denver，I was driving to my parents' home in Missouri for Christmas. I stopped at a gas station about 50 miles from Oklahoma City，where I was planning to stop and visit a friend. While I was standing in line at the cash register(收款台)，I said hello to an older couple who were also paying for gas.

    I took off，but had gone only a few miles when black smoke poured from the back of my car. I stopped and wondered what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas station. They said they would take me to my friend's. We chatted on the way into the city，and when I got out of the car，the husband gave me his business card.

    I wrote him and his wife a thank­you note for helping me. Soon afterward，I received a Christmas present from them. Their note that came with it said that helping me had made their holidays meaningful.

    Years later，I drove to a meeting in a nearby town in the morning. In late afternoon，I returned to my car and found that I'd left the lights on all day，and the battery(电池) was dead. Then I noticed that the Friendly Ford dealership—a shop selling cars—was right next door. I walked over and found two salesmen in the showroom. “Just how friendly is Friendly Ford？” I asked and explained my trouble. They quickly drove a pickup truck to my car and started it. They would accept no payment，so when I got home，I wrote them a note to say thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write him and say thank you，and it meant a lot，he said.

    “Thank you”—two powerful words. They're easy to say and mean so much.