Singles' Day — the Chinese opposite of Valentine's Day has turned into a massive online shopping event. It is a day when single people are supposed to buy themselves presents. But there are sociological reasons behind China's “celebration” of single life. And the imbalance could have big consequences for the country.

    There were 34 million more men than women in China in 2011. Part of that is natural – usually there are 105 boys born for every 100 girls. But the Chinese gender ratio (性别比例) at birth is much more obvious. It was 116 boys to 100 girls in 2012. The one child policy is largely to blame. Brought in to limit population expansion, the policy allows only one child per family. But because male children are seen as more valuable, as well as more likely to support their parents in old age, some parents choose to have a son over a daughter. The result is that large numbers of men will likely never get married. In fact, one study has predicted that by 2030, 1 in 5 Chinese men in their 30s will never have married, while another states that 94% of unmarried people in China are men.

    Traditionally, China has seen high levels of marriage, usually among the young. Besides, the increased education and career opportunities for women have meant that marriages are happening later. It is also traditional that women often marry men of a higher socioeconomic status than themselves. So women at the top and men at the bottom find themselves alone. One study has even suggested a link between an imbalanced gender ratio and growth in violent crime in the country.

    Singles' Day can't solve all the problems China's singles face. Indeed, it is possible that it is causing even more problems, as men resort to(诉诸于) increasingly risky lines of work to increase their chances of gaining money and thus a wife. I am worried that as money starts to overcome romance, there is evidence that China's marriage market is increasingly materialistic.

    For most of my 20 years as a teacher, summer vacation was my time to relax. So why was I standing in the schoolyard of an unfamiliar school, wearing myself out for a summer teaching job? The extra paychecks were nice, but I lacked the energy of my younger colleagues. Like Stella. She was in her early twenties, and made keeping up with the kids look effortless. She reminded me of myself, back when I was a bright-eyed student teacher at Ramona Elementary…

    I'd never forget my first day. I was too full of energy. Nervous energy. My supervising teacher was watching, and I wanted to make a good impression. I asked my third graders to take out their crayons for the day's lesson. All of them obeyed. Except one. A girl with two long, dark braids(辫子). Everyone called her Estrellita, or “little star.” Why was she unprepared for class? I demanded to know.

    “My sister has my crayons,” she said.

    “You should each have your own crayons,” I told her. “That's no excuse.”

    “There are 10 children in my family,” Estrellita said quietly, her big brown eyes never leaving my face. “We have to take turns.”

    I was taken aback. I'd completely misjudged the situation. All day Estrellita's words played on my mind. The next morning I bought a pack of crayons to leave on Estrellita's desk. She was so happy! That experience taught me an important lesson. Every student had a unique set of challenges—it was my mission to help my students overcome them. That mission used to energize(激励 )me.

    Rest was almost over. Stella turned to me and we started chatting. “How long have you been teaching?” she asked. I told her I'd started twenty years before, at Ramona Elementary.

    “I went to school there twenty years ago!” Stella said. I looked at her again, this time really seeing her. Those big brown eyes. That long, dark hair...

    “Did you use to have two long braids?” I said. “We called you Estrellita… ”

    Stella shouted. “ You ! You gave me the crayons!”

She'd become a teacher. To help students like I did. Even doing something that small mattered.

    That summer, I threw myself into teaching with a renewed sense of purpose. Estrellita had taught me a lesson once again.

    A recent study presents the possibility of “carbon farming” as a less risky alternative to other carbon capture and storage technologies. It suggests that a significant percentage of atmospheric CO₂ could potentially be removed by planting millions of acres of a shrub known as the Barbados nut（麻疯树）, in dry, coastal areas. But other experts doubted whether the Barbados nut would be able to grow well in sandy desert soils and absorb the quantity of carbon their models predict.

    The researchers behind the study say Barbados nut plantations（种植园）could help to reduce the local effects of global warming in desert areas, causing a decrease in average temperature and an increase in rainfall. If a large enough portion of the Earth were blanketed with carbon farms, these local effects could become global, capturing between 17 and 25 metric tons of CO₂ per hectare each year over a 20-year period.

    Carbon farms would not compete with food production if they were concentrated in dry coastal areas. In their analysis, oceanside desalination（海水淡化）plants provide a low-emission irrigation method. The study states that the Barbados nut is uniquely suited to growing in regions unsuitable for other crops .The plant, which produces a non-edible seed that can be used to create biodiesel（生物柴油）, is comfortable growing at temperatures exceeding 100 degrees Fahrenheit. It can also stand up to high levels of pollution in the soil, making waste water another potential source for irrigation.

    The cost of carbon farming is comparable to the costs associated with other carbon capture and storage technologies, the study claims. Wulfmeyer stressed that carbon farming could have “fantastic value for the local people” if international carbon markets pick up, promoting rural development and opening up the possibility of additional agriculture as the soil quality improves around the plantation.

    In an email, Van Noordwijk, a chief science advisor, questioned the growth rate and the atmospheric carbon capture rate assumed by the study's authors, calling the estimated carbon price of the plantations a “considerable underestimate”. “We are talking about a plant with a shrubby growth habit and a long track record of misleading farmers with production potentials that are not being realized,” he said, and “Even with abundant water, the nutrient storage in sandy desert soil is low. He added, “The estimated carbon price of this option already indicates that there are far better opportunities for reducing ongoing emissions from peatland（泥炭地）use and deforestation.”

    Watching some children trying to catch butterflies one hot August afternoon, I was reminded of an incident in my own childhood．When I was a boy of 12 in South Carolina, something happened to me that cured me forever of wanting to put any wild creature in a cage.

    We lived on the edge of a wood, and every evening at dusk the mockingbirds would come and rest in the trees and sing. There isn't a musical instrument made by man that can produce a more beautiful sound than the song of the mockingbird.

    I decided that I would catch a young bird and keep it in a cage and in that way would have my own private musician.

    I finally succeeded in catching one and put it in a cage. At first, in its fright at being captured, the bird fluttered about the cage, but eventually it settled down in its new home. I felt very pleased with myself and looked forward to some beautiful singing from my tiny musician.

    I had left the cage out on our back porch, and on the second day of the bird's captivity(囚禁) my new pet's mother flew to the cage with food in her mouth. The baby bird ate everything she brought to it. I was pleased to see this. Certainly the mother knew better than I how to feed her baby.

    The following morning when I went to see how my captive was doing, I discovered it on the floor of the cage, dead. I was shocked! What had happened! I had taken excellent care of my little bird, or so I thought.

    Arthur Wayne, the famous ornithologist, happened to be visiting my father at the time, hearing me crying over the death of my bird, explained what had occurred. “A mother mockingbird, finding her young in a cage, will sometimes bring it poison berries. She thinks it better for her young to die than to live in captivity.”

    Never since then have I caught any living creature and put it in a cage. All living creatures have a right to live free.

May's Midi Festival

    As a rock festival, the Midi Festival 2017 in Beijing presented a musical carnival for fans. It was the 13th year of the outdoor music feast. This year, about 100 rock bands from home and abroad performed on five stages. It was held at a suburban park known for its mountains and grasslands. With beautiful scenery and exciting music, it was a good opportunity to enjoy rock with friends and family.

    2：00—10：30 P. m. , from April 29 to May 1. China Music Valley Grassland Park, Pinggu District. 400-610-3721.

    Fans of Painting

Ancient Chinese calligraphers(书法家)and painters were fond of painting on the folds of fans. Their excellence has left a wealth of outstanding works. A fan painting show exhibited 990 Ming and Qing(1368—1911)dynasty calligraphy and painting works on folding fans. They were selected from the collection of the National Museum of China. The themes of these fan paintings fell into four categories：natural landscapes, flowers and birds, figures and calligraphy.

    10：00 a. m. —2：30 P. m. , from April 29 to May 29. National Museum of China, 16 East Chang'an Avenue. 010-651-6400.

    Poetic Portraits

    Two artists held a joint exhibition with paintings featuring portraits of Chinese women in poetic poses. Wang Xiaojin, who is from Shandong Province, has been exhibiting since 1993. The other artist, Xu Zhigang, is originally from Liaoning Province, but is now in Beijing.

    10：00 a. m. —8：00 P. m. , from April 28 to June 20. Rong Gallery, Sheraton Pudong Hotel, 38 Pujian Road, Pudong New Area. 0137-6408-7294.

    Group Show

    The artist group,“island6”, worked in new media and held a show titled     Body-City-Mechanism. Through interactive video, photography, oil on canvas and sculpture, the artists explore themes of man and cyberspace.

    10：00 a. m. —6：00 P. m. , from April 30 to June 28. Studio Rouge, 50, Moganshan Road, Putuo District. 021-5252-7856.

Tunnels are passageways that are built under the ground. They can also be made under a sea or a river. Some tunnels are dug through high mountains.

For hundreds of years, tunnels have been built all over the world. People use these tunnels to travel from one place to another. Some tunnels are used as waterlanes. Coal and gemstones are also brought from under the ground through long tunnels.

In the past, people dug tunnels using picks and shovels. Rocks and soil were loaded into one-wheel barrows and then onto horses and carts. This work was very tiring.

Today, engineers do a lot of planning before they start to build a tunnel. They use computers to check the level of the water and the types of rock under the ground. When they are sure the area is safe, huge machines are used to dig out the soil.

These machines have an enormous cutting wheel at the front. The wheel slowly grinds (磨碎) through the rock and soil to make the tunnel. Soil that is not needed is carried away in large trucks. As the tunnel becomes longer, it is lined with huge pipes so the walls and roof do not callapse.

Long tunnels have powerful lights to help drivers see the road ahead. Water sprinklers (洒水装置) are fitted to help keep people safe if a fire breaks out in the tunnel.

In large cities, tunnels are built under very busy roads. , People can drive through these tunnels. This makes it quicker to travel to different parts of the city.

Some trains have to wind slowly and carefully over steep mountain slopes. But, in places where there are tunnels, trains can travel quickly through the mountain to reach the other side.