阅读下列短文，从每题所给A、B、C、D四个选项中，选出最佳选项。
A
In 1989, fresh out of school, I had the difficult task of choosing a career path before college started in three months. With limited options, I was in deep trouble. My uncle suggested that I should do a work placement to gain experience for a month in a bank followed by a month in a hospital so that I could make a decision. It seemed like a brilliant idea.
Near the end of my month at the hospital, 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 bank was going to win out.
Then one day I was driving home from the hospital. Before me was a public bus, with college students sitting on the roof. As the driver weaved (迂回前行) through traffic, I could see the boys shaking from side to side.
Suddenly, a boy rolled off and hit the road face down. He lay motionless in the middle of the road as the bus sped away. The cars directly behind the bus braked to avoid the boy, but none stopped. Actually, I wanted to keep going too, but the urge to stop and help was stronger. I got out of my car and tried to stop his bleeding but didn't succeed. With the help of some bystanders, I lifted his unconscious body into the back seat of my car, and raced back to the hospital.
The next day, the doctor introduced me as “the person who saved your son’s life” to the boy’s parents， grandparents, sisters and brothers. Everyone got up, with grateful smiles on their faces. The boy, now managed a smile though unable to speak.
What a feeling it was to help save the life of another person! I spent the rest of the day in a state of excitement. Driving home that evening, I knew what I would prefer for the rest of my life.
21. What can we know about the writer from the first two paragraphs?
A. The writer had difficulty in choosing a college.
B. The writer was a person not fond of uncertainty.
C. The writer was at a loss what major to choose in the college.
D. The writer adopted his uncle's advice to enter a better college.
22. Which of the following can best describe the writer?
A. Warm-hearted and persistent.
B. Sympathetic and helpful.
C. Kind and generous.
D. Determined and brave.
23. What does the writer want to convey through his story?
A. Follow your heart and just do it.
B. Jack of all trades and master of none.
C. Words must be believed, and deeds must bear fruit.
D. People respond sincerely to those who are touching by sincerity.
