根据短文内容，完成下列任务。

    China has its first Nobel Prize in Science. And the winner, 84-year-old Chinese scientist Tu Youyou, also became the first Chinese woman to win the Nobel Prize. She won the 2015 Nobel Prize in Physiology or Medicine with William C. Campbell, an Irish-born researcher, and Satoshi Omura of Japan. The three winners will share the prize of 8 million Swedish crowns ($920,000).

    Half of the Prize was given to William C. Campbell and Satoshi Omura for their new treatment against illness caused by roundworm parasites (寄生虫). Tu Youyou won the other half of the Prize for developing a medicine, Artemisinin(青蒿素), which can help people fight malaria(疟疾). More than 240 million people in Africa have benefited from the treatment, according to the WHO (World Health Organization), and more than 1.5 million lives have been saved since 2000, thanks to the medicine.

    Tu Youyou started her research in 1969 when she was chosen as the director of a government project to find anti-malaria medicines. She and her workmates studied ancient Chinese medicine books and many different traditional treatments. They did nearly 200 experiments before they finally succeeded in getting the material Qinghaosu, later known as Artemisinin, in the 1970s. This medicine became the standard treatment for malaria in the WHO's list of important medicines.

    Premier Li Keqiang congratulated Tu for winning the Prize. He said, "Tu's winning the prize shows China's progress in scientific and technological field, and marks a great contribution of Traditional Chinese Medicine (TCM) to human health."

    Although it's a late honor for Tu and the world's recognition of Traditional Chinese Medicine, Tu's winning the first Nobel Prize in Physiology or Medicine makes Chinese scientists encouraged and confident to achieve more success in the future.

    When William Brown taught at Boston University, he once thought about the people that he hadn't thanked in his life. They taught him, encouraged (鼓励) him or cared a lot about him.

    Tina Johnson was a teacher. She once taught William geography, and William loved geography all his life. So he wrote a letter of thanks to her.

    He got the teacher's letter later. It began, “My dear Willie”. He was happy. Now over 50, he didn't think someone would called him “Willie”. Here is that letter.

    My dear Willie,

    I cannot tell you how much your letter meant to me. I am in my eighties, living alone in a small room and cooking my own meals. You will be interested to know that I taught school for 50 years and yours is the first letter of appreciation (感激) I ever got. It came on a cold morning and it made me feel very warm.

    ......

    William cried when he read the letter. She was one of the people that William hadn't thanked in his past. She helped him to believe in himself. He would never forget her.

    There are some people we should always remember, because they helped to shape our life. William Brown found a way to show his appreciation—he wrote them letters.

    Who are some of the people that you need to say thank you to in your past? It may be too late to say “Thanks”.

Only a Ribbon

    In one of the London hospitals，a short time ago，there was a young doctor. He noticed one of the patients，a ten-year-old poor girl called Katie，who had a very painful illness.

    Katie lay in her bed，day after day，with nothing to help her forget her pain and cheer up. One day the doctor noticed her trying to make a doll of her finger, and speaking to it. But she was soon tired of it，and lay back into her bed.

    That afternoon，the young doctor saw a beautiful ribbon in a shop window. He thought that it might help cheer the little girl up，so he went in and bought it for her. When he handed the ribbon to the girl，she was too surprised to speak. There were tears in her eyes. This little gift made her feel rich and happy.

    The nurse later told the doctor that the girl played with the ribbon all day long. She twisted（盘绕）it round her head. She held it in her hand while she slept.

    Some weeks later，Katie's illness became worse，and it was necessary to perform a dangerous operation. When Katie was brought into the operation mom，she cried out for the young doctor. He was brought，and he held one of the girl's hands，while the other tightly held the ribbon.

    During the operation，the ribbon fell off Katie's hand. As soon as she woke up and opened her eyes，she looked at her friend and said in a low voice，“My ribbon.”The doctor gave it to her and she smiled happily.

    It was only a little gift，but it made the girl's stay in the hospital bright with beauty and love.

    Gregg's dream was to travel around the Americas(美洲). He got the idea after he finished a long bike ride. Gregg's friend, Brooks, also liked riding a bike. The two friends talked and made a plan，they would travel from Alaska to Argentina by bike.

    To pay for the trip, Gregg and Brooks worked to save money for a long time. When they were on the road, they often camped outdoors and ate cheaply. In many places, local people opened their doors to the two friends and gave them food.

    On their way, there were deserts, rainforests and mountains. They visited modern cities and ancient ruins. And they made many friends from all over the world.

    Two years later, Gregg finally reached Ushuaia, Argentina in May 2007. (Near Guatemala, Brooks had to go back and Gregg continued without him.)

They both learned a lot about traveling. Here are some of Gregg's suggestions.

Travel light. You shouldn't carry many things with you.

    Be flexible(灵活的)• Don't plan everything. Then you'll be more relaxed and pleased. Be polite. One traveler told Gregg, "Nobody wants to cheat a nice man." It's true.

    Alfred Nobel, the great Swedish inventor and engineer, was born in Stockholm on October 21, 1833, but moved to Russia with his parents in 1842, where his father, Immanuel, made a strong position for himself in the engineering industry. Immanuel Nobel invented landmines and made a lot of money from the government during the Crimean War(克里米亚战争), but went bankrupt soon after. Then, the family returned to Sweden in 1859, where Alfred began his own study of explosives in his father's lab. He had never been to school or university but had taught himself, and by the time he was twenty, he became a skillful chemist and excellent linguist, speaking Swedish, Russian, German, French and English. He built up about 100companies in 20 different countries. He was always searching for a meaning to life. He spent much time and money working on how to end the wars, and the peace between nations, until he died in Italy in 1896. His famous last will, in which he left money to provide prizes for outstanding work in physics, chemistry, physiology or medicine, literature and peace, is a memorial to his interests and ideas. And so, the man is remembered and respected long after his death.

    In the summer between my first year and second year in college, I was invited to be an instructor(辅导员)at a high school camp. On the first day, when we were dancing and playing games, I noticed a boy under the tree who was small and thin. His shyness made him appear weak. I walked towards him, introduced myself and invited him to join in the activities and meet some new people. He quietly replied, "No, I really don't want to do this." I could understand that he was in a new world but I knew it wouldn't be right to force him either. Actually, the boy didn't need a close talk but a friend.

    At lunch the next day, I was leading camp songs when I saw the boy under the tree sitting alone. I tried again with the same invitation, but he refused once again. That evening I was told the boy's name was Tommy. Then I asked the campers to pay special attention to the boy and spend time with him when they could.

    The days went by and the time came when we had to leave. We held a big, warm party to celebrate the closing of the camp. All the campers shared their wonderful moments. To my surprise, I found the boy from under the tree dancing joyfully with two girls. I couldn't believe it was the same person.

    In October of my second year, I received a phone call from Tommy's mother. She told me that Tommy was hit by a car and died. I offered my deep sadness. The mother said, "Tommy mentioned you so many times. I want you to know that he went back to school and made new friends with confidence. You made a difference to Tommy during his last months."

    At that moment, I realized how easy it was to give a bit of yourself every day. You may never know how much each gesture may mean to someone else. I hope that everyone can pay attention to his own "boy under the tree".