2 . Some colors that people see late at night could cause signs of the condition mental health experts call clinical depression. That was the finding of a study that builds on earlier study findings. They show that individuals who live or work in low levels of light overnight can develop clinical depression.

Doctors use the words “clinical depression” to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and thoughts of death or suicide.

In the new study, American investigators designed an experiment that exposed hamsters to different colors. The animals were separated into 4 groups. One group of hamsters was kept in the dark during their nighttime period. Another group was placed in blue light, a third group slept in white light. While a fourth was put in red light. After four weeks, the researchers noted how much sugary water the hamsters drank. They found that the more depressed animals drank the less amount of water.

Randy Nelson, who heads the Department of Neuroscience at Ohio State University, says animals that slept in blue and white light appeared to be the most depressed. “What we saw is these animals didn’t show any sleep disruptions at all but they did have messed up circadian clock genes (生物钟基因)and they did show sign of depression whereas if they were in the pale red light, they did not.” He says there’s a lot of blue in white light, which explains why the blue light and white light hamsters appear to be more depressed than the hamsters that see red light or darkness.

Mr Nelson has suggestions for people who work late at night, or those who like to stay up late.

“My recommendation is if you are just living a typical mostly active life during the day, mostly inactive at night, you need to limit exposure to TVs which are quite bluish in the light they give off and computer screens and things like that. You can get filtered glass, you can get filters (过滤器) on your computer screen and filters on your eReaders to put it more in the reddish light.”

5 . Spanish artist Pablo Picasso (1881—1973 ) was one of the greatest artists of the 20th century. It was said that everything his brush touched turned to gold. But in truth, his works could be worth more than any precious metal. Picasso created more than 20,000 works in his life, including two of the world's 10 most expensive paintings.

Between 1907 and 1913, Picasso and his colleague Georges Braque started a revolution(革命) in painting. Before that, paintings were like windows—they were painted to look as if they had depth. You could tell which objects were "close" to you and which objects were "far away". But Picasso and Braque didn't want to paint like that any more. To them, a painting wasn't a window to the world; it was marks and lines on a flat surface. Why, they thought, should an object like a guitar be shown only from one angle (角度)? A guitar can look very different depending on which angle one looks at it from. Their answer was to show all the angles. They broke the guitar up into pieces. Their style of painting is called cubism (立体主义).

But why did they feel such a need to change things? Well, the world around them was changing, too. Science was turning people's ideas upside down. Albert Einstein's theory proved that what we knew about time and space was wrong. The world was becoming different; artists needed to start seeing and painting it differently.

The famous and terrifying painting Guernica (1937) shows a terrible scene during the Spanish Civil War. In the painting, you can actually see the sky falling. Picasso couldn't have painted it without the skills he learned during his cubist period. Breaking a guitar up into pieces was his preparation for showing the world being blown to pieces.

6 . In 2020, John Constantino began doing a study at schools across New York. He had just completed a Ph.D. in language and learning and he was analyzing children's access to ________ in rich and low—income communities.

One day, he ________ something that stopped him in his tracks. "I was at a ________ in a wealthy community, and they were ________ almost brand—new books because they didn't have ________ in the library," Constantino said. He put the books in his car and drove them to a school in an ________ community.

Shocked by the ________ he saw in public school libraries, Constantino became ________ to bridge the gap. “School libraries are not funded well, and sometimes not funded at all,” he said. “If you're a(n) ________. in an underserved community, ________ you’re left with boring, outdated, and uninteresting books.

Word spread about Constantino's work, and books began ________. Donors buy new, hardcover books. Kids ________ what they think are the most interesting books. Today, his nonprofit, Access Books, has ________ more than 1.5 million books to public— school and community libraries across New York. The group has also ________ close to 350 libraries in public schools, making sure the reading environment is relaxing and comforting.

“________ we provide high—interest books and a ________ library space, they do come and they do read. We found that in the schools that we serve, circulation doubles and triples ________ we've come. So, we know that kids come to the ________.

And the books that we give, they’re ________ to keep on the shelf because we' re giving books that kids are really ________ in. My goal is that kids can always have a friend in a book and they can always turn to a book to find comfort and to learn something.” said Constantino.

9 . For many of us, being alone is a negative state of being, implying isolation, being on the outside. Even further, it may imply that there is something actually wrong with a person who remains alone.     1     However, once mastered, it serves as the cornerstone for your development and growth as a human being.

Aloneness enhances your creativity.     2     When you are alone, you are more likely to stay true to yourself and try new things that you don't have the courage to do around others. Picasso or Van Gogh wouldn't have created the masterpieces if they hadn't taken enough solitary（独处的)time to experiment regardless of others' thoughts.

Being alone also prevents you from burning out. Sometimes you may wonder why you easily feel tired. One reason could be not giving yourself enough solitary time. Especially for people who go to work every day, it is unavoidable to feel exhausted when you have to deal with work, family, and your own passions at the same time.     3     It doesn't matter how you choose to spend those moments alone. As long as they relieve your stress, they're worthwhile.

    4     When you take time to understand yourself, pursue your personal growth, and follow your dreams, you'll definitely discover the truth about yourself. Regardless of how well you may think you know yourself, learning how to be alone will allow you to deepen your self-awareness.

Being alone makes you a more creative person and helps with personal growth.     5    

Last weekend my classmates and I took part a voluntary activity in the community, which is actually organized by our school. As planned, they met at 9 on the Saturday morning at the school gate. When we arrived, we first went to the old people home in which we told stories but put on a talent show. What’s more, we visited some sick kid and gave them some gifts, what I thought could encourage them a lot. Finally, we helped to cleaning up the city parks so that people could have a clean and beautiful environment. How meaningfully it was!