1 . Many college students turn to ADHD (注意缺陷障碍) medicine during the exam week, which is regarded as “smart drugs” that will help their academic (学术的) performance. The thinking is that if the drugs help students with ADHD improve their focus, they should provide the same benefit for people who don’t have the disorder.

But a new study shows that drugs can actually damage brain function of healthy students who take the drug hoping to boost their intelligence. “It’s not a smart drug which will suddenly improve their ability to understand information they read,” said Lisa Weyandt, a professor at the University of Rhode Island.

To test whether this effect is real or not, researchers organized 13 students to take part in two five-hour study sessions(一段时间)in the lab. The students took the standard 30mg ADHD drugs before one session, and a sugar pill before the other. Students on ADHD drugs did experience an increase in their blood pressure and heart rates. “The medicine was having an effect on their brain,” Weyandt said. The students also showed an improvement in their ability to focus, the researchers found.

However, students on ADHD drugs experienced no improvement in reading comprehension, reading fluency or knowledge reviews, compared to when they’d taken a sugar pill. “We read aloud stories to them and asked them to recall information from the stories,” she said. “That didn’t improve.”

Worse, the ADHD drug actually harms students’ memory. It’s often misused because people pull all-nighters and they’re tired, and they think it’s going to keep them awake. Maybe it does, but it’s certainly not going to help their academic work. The brain is still developing until the mid to late 20s. It’s important to keep it healthy. There’s also a chance that ADHD drugs could endanger a student’s heart health.

2 . Liu Jichen, 23, a student from Tsinghua University, has developed a WeChat mini-program called “Clear Your Plate”. After a meal, users can open the mini-program and take a picture of their empty plates. Once the image is recognized by the AI(Artificial Intelligence), students can collect points and use them to buy gifts or purchase charity meals to children in impoverished(贫困的) rural areas.

Liu and his team, together with other organizations, launched the “Clear Your Plate” campaign in November for the third year. It has swept over 1,017 universities across the country. The one-month campaign attracted almost 1.6 million participants and collectively reduced food waste by 862 tons and carbon emissions(碳排放) by 3,337 tons.

“Technological innovation is a good way to reduce food waste,” Liu thought. He organized a team of 20 members to work on the project at the end of 2017. To solve the AI’s problem of identifying photos of empty plates, the team spent half a year collecting over 100,000 samples in canteens and restaurants. In 2018, the mini-program was officially put into operation on Oct 16, World Food Day. They then launched a campaign later that year.

“There were so many unknowns in research and development. For our team members, the biggest challenge was whether we were confident enough to complete it,” Liu said. They not only achieved their goal, but now, the mini-program has more than 5 million registered users, according to Liu. “We hope our efforts can start a new trend among the younger generation by encouraging them to cherish(珍惜) their food and develop the habit of thrift(节约),” Liu added.

I’d like to share a story that happened a few days ago but still makes me happy. I lived in    1    (German) at that time of the year. It was cold and the    2     (street) were often wet and everyone liked to get home or to a warm place as quickly as possible.

One evening, I     3     (walk) along the sidewalk when I saw a toy rabbit.     4    (I) first thought was joy, “Oh! Rabbit! Sweet.” Then, trained by small acts of kindness, I wondered     5    I could be of help and who    6    (lose) the rabbit.

Then I remembered that a woman with a carriage had just passed. I picked the rabbit up, called to    7    woman and showed the rabbit to her. She turned around with her sleeping child, checked the carriage, and said    8    a smile, “Thank you so much! You saved my evening!” There was so much joy in her face,     9    (make) me happy still to this day.

And it taught me    10    (be) caring even on the risk of failing.

9 . My great-grandfather, my grandfather and my father are all farmers. My father expects me to become a farmer and_________them all but I don’t agree with my father.

Three years ago, my father took me to a(n) _________to visit one of his friends. His friend_________a small airline. It was the first time I had seen a_________airplane. After my father’s friend discovered I had never been in an airplane, he_________me to fly with them. When we took off, I felt very excited.

Since then, if I had time, my father’s friend would teach me how to fly.He even let me fly_________once. I wanted to become a pilot but to do this, I would have _________my father’s wishes.

At the age of 18 ,I had to tell my father what I wanted to do but I didn’t want to make him_______. As he walked ahead of me and followed, I didn’t know what I could say to help him understand my_________ for flying. I took my courage and said,“Father,I have something__________to tell you. I want to go to college and become a pilot, I have talked to the schools and they agreed to__________me financial(经济的)help.”I felt nervous in his__________. Then he spoke,“I was wondering when you would tell me. I have been__________money for you.” When I heard this, I couldn’t help____________ For the first time I really understand his____________love for me.