Popular music in America is what every student likes. Students carry small radios with earphones and listen to music before class, after class, and at lunch. Students with cars buy large speakers and play the music loudly as they drive on the street.

    Adult(成年人) drivers listen to music on the car radio as they drive to work. They also listen to the news about sports, the weather, and the life of American people. Most of the radio programmers（节目）are music.

    Pop or popular music singers make much money. They make a CD or tape which radio stations use in many places. Once the popular singer is heard all over the country, young people buy his or her tapes. Some of the money from these tapes goes to the singer. Wherever the singer goes, all the young people want to meet him or her. Now the singer has become a national star.

    There are other kinds of music that are important to Americans. One is called folk music. It tells stories about the common life of Americans. Another is called western or country music. This is started by cowboys（牛仔）who would sing at night to the cows they were watching. Today, any music about country life and the love between a country boy and his girl is called western or country music.

    More and more comment(评论) sections are being shut down online.

    Autumn Phillips had had enough. On August 19, the executive editor of the Quad-City Times in Iowa, and Illinois, US visited her website, qutimes. com, and saw a story about a man who had been shot to death. When she got to the readers' comments section at the end, she was shocked by what she saw. Below the story was a growing string of comments—a racist remark about democratic( 民主的) voters, a negative comment about police...So Phillips decided to do something she had been thinking about for a long time: she shut down the comment section.

    Phillips was not alone in making such a move. Last week, NPR announced it too was closing its online comments section. The decisions don't mean that the news outlets are no longer interested in what their audiences are thinking. Both stressed their eagerness to hear from readers and listeners on social networks. But both agreed that comments had deviated from their original intention. And so they had.

    In the early days of digital journalism, comments were seen as a key part of the new media, a wonderful opportunity for strengthening the dialogue between news producers and their audiences. It was a welcome change, given that for long many news organizations were far too separated from their readers. Much more back and forth conversation seemed like healthy and welcome evolutions. Sadly, that's not the way things turned out. Rather than a place for exchanging ideas, comments sections became the home of ugly name-calling, racism and anti-women language. Besides their poisonous quality, comments seem out of place today.

    “Since we made the announcement, I've received an outpouring of responses from our readers,”she says. “I've heard from parents whose children were hurt by our online comments. I've heard from people who said they wouldn't send in letters to the editor because they were attacked so fiercely by comments, and it wasn't worth it.”

    With child behavior, there is almost much more than it meets the eye. Because it occurs at so many different levels, child behavior that seems simple at one level can often be much more complex and meaningful at another.

    For instance, a little child's pattern of getting into cupboards, drawers and closed rooms, even after being told not to, is easily considered as bad behavior. When viewed at that level, the pattern is unacceptable and could lead to punishment. But it can be viewed at a more complex and meaningful level, namely child exploration. If a child regularly experiences an angry parent who seems determined to prevent any exploratory activities, the child will decide to continue to achieve future discoveries. When parents view this behavior as born out of natural curiosity rather than simple opposition, they are more likely to accept and appropriately monitor it. Although it may lead to warning responses to ensure the child's safety, it is less likely to lead to punishment.

    There are countless other examples. Holding a goldfish outside its bowl is foolish at one level but also can be seen as a young child's attempt to express physical affection for a pet. Spending time with friends rather than family is selfish at one level but also indicates a teen's need for independence.

    The point here is that child behavior is often exhibited in simple forms that can appear to be oppositional, selfish or generally unacceptable if viewed only at that basic level. However, when viewed at a more meaningful level, the same apparently simple behavior can be seen as something larger and potentially more adaptive. This doesn't mean the behavior should be ignored, especially if it is inappropriate. But looking at the bigger picture of a child's behavior, adults might gain a fuller understanding of what they're dealing with, which can create more flexibility in how they respond.

    Breathing dirty air comes at a high price. Air pollution lowers the average life spans (寿命) by a year worldwide and in more polluted parts of Asia and Africa, dirty air shortens lives up to twice that much. Scientists shared their new findings in Environmental Science & Technology Letters. The study used data gathered in 2016 as part of a project known as the Global Burden of Disease and was the first major country-by-country look at the connection between the length of life and what's known as fine PM.

    Air pollution has been linked to many health problems. Most earlier studies had looked at how tiny air pollutants affected rates of illness or death. Joshua Apte is an environmental scientist at the University of Texas at Austin. By looking at life expectancy (预期寿命), his team had hoped to make the threat easier to understand. PM2.5 is what scientists call tiny particles (颗粒) of pollution in the air. Higher levels of PM2.5 can cause health problems and cut months, if not years, from the average length of life. This analysis shows how pollution affects life expectancy in different parts of the world.

    The World Health Organization (WHO) recommends limiting PM2.5 to 10 micrograms per cubic meter of air. Apte's group calculated how holding pollution to this low level would help people. In countries with very dirty air, meeting this standard would lengthen people's lives. However, in countries whose air already meets this standard, the study shows no gain in life expectancy. In other words, meeting the WHO standard won't reduce health costs resulting from dirty air because even below 10 micrograms per cubic meter, pollution still causes serious risks. Meanwhile, the scientists compared how other threats including smoking and cancer shorten the length of life across the globe.

    Until the 1990s coffee was rarely served in China except at luxury hotels aimed at foreigners. When Starbucks opened its first shop there in 1999, it was far from clear that the country's tea-drinkers would take to such a different and usually more costly source of caffeine. Starbucks tried to attract customers to coffee's bitter taste by promoting milk and sugar-heavy concoctions(调和) such as Frappuccinos.

    But coffee has become fashionable among the middle class in China. Starbucks now has about 3, 800 shops in China more than in any other country outside America. Statista, a business-intelligence portal(门户网站), says the roast coffee market in China is growing by more than10 %year. Starbucks and its rivals see big opportunities for expanding there.

    So too, however, do home-grown competitors. A major new presence is Luckin Coffee, Beijing- based chain. Since its founding less than two years ago, it has opened more than 2,300 shops. On May 17th Luckin's initial public offering on the Nasdaq stockmarket raised more than $570m, giving it a value of about $4bn.

    Luckin's remarkable growth is sign of change. No longer do Chinese consumers see coffee as such a luxury. Most of Luckin's shops are merely kiosks where busy white-collar workers pick up their drinks, having ordered them online. Super-fast delivery can also be arranged through the company's app. Independent coffee shops are springing up. The growth is striking considering the country's reputation for its tea-drinking culture where many residents like to relax in teahouses sipping tea served gracefully.

    But the two markets are different. The teahouses tend to cater to older people who like to spend long hours playing mahjong and gossiping. At the coffee shops it is rare to see anyone over 40. Young people use them for socialising, but much of their interaction is online -sharing photos of their drinks and of the coffee-making equipment. An option on the Chinese rating app Dianping allows users to search for wanghong ("internet viral") coffee houses.

The outbreak of locusts, an insect that mainly lives in Africa and Asia, is the worst experienced by Kenya in 70 years. The crowds are some three times the size of New York City, eating their way through thousands of acres of crops and animal grassland and destroying livelihoods in the process.

"These hungry things are alarming," says Keith Cressman, the UN Food and Agriculture Organization's senior locust forecasting officer. "A crowd the size of Manhattan can, in a single day, eat the same amount of food as everyone in New York and California combined."

Desert locusts are infamous for their ability to breed(繁育)rapidly in large numbers every three months. And with some help from the wind, they can travel as much as 80 miles a day. Most years, the insects stay in African deserts. However, under the right environmental conditions, they can multiply quickly, spread as much as 400 times every six months and cause extensive destruction if left unchecked.

"The insect has the ability to take advantage of good conditions." Cressman says.

The "good conditions" the scientist is referring to began in mid-2018 when a rainstorm from the Indian Ocean struck a remote area of the Arabian Peninsula known as the "Empty Quarter". Normally, it would dry out within a short period, killing most of the locust population, which depends on green plants for food. However, in late 2018, a second rainstorm struck the same region. The huge sandy area got wet, which is exactly what desert locusts need to lay their eggs and breed. The extra food supply caused the population to explode for the second time in six months.

Luckily, the locusts, experts say, are easy to control with chemicals. Kenya badly needs equipment and a steady supply of chemicals to effectively wipe out the massive insects. Hopefully, leaders worldwide will recognize the tough situation and contribute generously to control the locust outbreak.