阅读下列材料，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。

    After that, we went on down the river. It was very dark that night and it wasn't easy to see where we were going. Suddenly, a big steamboat came at us very fast, and the next minute it was right over us. Jim and I jumped off the raft (木筏) into the water. The boat hit the raft and went on up the river.

    When I came up out of the water, I couldn't see Jim anywhere. I called out his name again and again, but there was no answer. “He's dead!” I thought. Slowly, I swam to the side of the river and got out. I saw that I was near a big old wooden house. Suddenly a lot of very angry dogs jumped out at me. They made a terrible noise and someone called from the house, “Who's there?”

“George Jackson,” I answered quickly. “I've fallen off a river boat.”

    Well, the people who lived in that house were very kind, and they took me in and gave me some new clothes and a good meal. I told them that my family were all dead, so they said I could stay with them as long as I wanted. It was a beautiful house and the food was good there, so I stayed.

    A few days later one of the slaves in the house came to me and said, “Come with me!” Together, we went down to some trees by the river. “In there!” he said and went away.

    On the ground, I found a man, asleep. It was Jim! I was really pleased to see him. When the steamboat hit the raft, Jim told me, the raft didn't break up. Jim swam after it and caught it. Then he began to look for me.

We decided to leave at once. It's all right living in a house for a little while, but you feel more free and easy and comfortable on a raft.

    Erik Weihenmayer was born with an eye disorder. As a child his eyesight became worse and then, at the age of 13, he lost his sight completely. However, he did not lose his determination to lead a full and active life.

    Erik became an adventurer. He took up parachuting, wrestling and scuba diving. He competed in long-distance biking, marathons and skiing. His favorite sport, though, is mountaineering.

    As a young man, Erik started to climb mountains. He reached the top of Mount McKinley in 1995 and then climbed the dangerous 1000-metre rock wall of EI Capitan. Two years later, while climbing Mount Kilimanjaro in Kenya with his girlfriend, they stopped for a time at 13,000 feet above sea level－in order to get married. And on May 25, 2001, at the age of 33, Erik successfully completed the greatest mountaineering challenge of all. He climbed Mount Everest, the highest mountain in the world two years after he climbed Aconcagua, the tallest mountain in South America in 1999．

    Erik invented his own method for climbing mountains. He carries two long poles: one to lean on and the other to test the way ahead of him. The climber in front of him wears a bell to guide him. Erik is a good team member. He does his share of the job, such as setting up tents and building snow walls.

    Although he could not enjoy the view, Erik felt the excitement of being on the top of Everest. He hopes that his success will change how people think about the blind．"When people think about a blind person or blindness, now they will think about a person standing on top of the world."

    Zhao Muhe is a 105-year-old man from Taiwan. Praised by many people as an ideal role model, Zhao's motto is that it's never too late to learn. He is now auditing(旁听)classes at National Tsing Hua University in Taiwan as he prepares to earn a PhD.

    Zhao entered Open University of Kaohsiung in Taiwan in 1999.He went to school by bike every day, never missing a single class. He studied late into the night, and it only took Zhao four years to finish the 128 academic credits required to graduate, which he did at the age of 91.

    Several years later, Zhao decided to continue his studies. He passed the entrance examination for Nanhua University in Taiwan and got a master's degree two years later. The 98-year-old set a Guinness World Record as the oldest postgraduate in the world.

    In 2016, Zhao started classes at National Tsing Hua University. He lives alone on the fourth floor of an old apartment building. He does his own shopping, cooking and laundry, refusing other's help because he thinks it would make him feel old.

    Zhao was born in Shandong Province in 1912. Influenced by traditional Chinese culture, he studied at a private school and started to study calligraphy(书法)when he was 14.Years of practice made him a calligraphy master. Over the decades, he has donated plenty of money raised by calligraphy charities to people in need.

    Zhao held a calligraphy exhibition in Hong Kong in 2013, and also published an autobiography. As he couldn't use a computer at that time, the autobiography was written by others, based on Zhao's oral narration. After the book was written, Zhao decided that he should learn how to use the Internet. Now he can buy his own tickets online.

    Daisy is an American high school student, and she wants to be a doctor when she grows up. It's important to start early if you want to become a doctor. Why? In the USA, you will need to take some science classes in college or university before you attend medical schools. Besides schoolwork, medical schools, medical admissions. (录取）will also look at your extra﹣curricular (课外的) activities.

    To attend medical schools, Daisy decides to do as follows. First, she will visit the school library weekly and read articles about medicine. Then, she will meet with some doctors from her friends' families. Daisy is going to ask them some questions about their work, so she will get some useful information. Daisy also plans to volunteer at a hospital for a week. If you would like to help others, you will be welcome to medical schools Daisy is sure about this.

    The good news is that Daisy is 16 years old, so she can do the training to become a Certified Nurse (执业护士助理). She is going to finish doing this in three weeks during the summer. When you become a CNA, you can make good money. But to Daisy, it just helps her improve herself and makes her a better student before going to the medical school.

    As a high school student, Daisy knows what is the most important now: study hard and do well in science, including biology, physics and math. These lessons always have to do with medicine.

  By starting early and taking some of these steps, Daisy is sure that she will become a doctor!

    How nice to meet you all! Let me tell you a little bit about myself.

    My name is Li Ming. I am from Shenzhen. There are three people in my family. My father is a Maths teacher and my mother is an English teacher. We all love playing sports very much. My favorite sport is football. My parents are crazy about badminton.

    From now on we study together and live together. I think we should love and help each other. And we must love our school and teachers! Let's be good friends. Let's get to know each other better. Let's become a real family here at school.

    It's time for us to depend on(依靠) ourselves. Never let our parents down! The future belongs to us.