Probably no other musical instrument is as popular as the guitar around the world. Musicians use the guitar for almost all kinds of music. Country and western music would not be the same without a guitar. The traditional Spanish folk music called Flamenco could not exist without a guitar. The sound of American blues music would not be the same without the sad cry of the guitar. And rock and roll music would almost be impossible without this instrument.

    Music experts do not agree about where the guitar was first played. Most agree it is ancient. Some experts say an instrument very much like a guitar was played in Egypt more than 1,000 years ago. Most experts say that the ancestor of the modern guitar was brought to Spain from Persia sometime in the 12^th century. The guitar continued to develop in Spain. In the 1700s it became similar to the instrument we know today.

    Many famous musicians played the instrument. The famous Italian violins Niccole Paganism played and wrote music for the guitar in the early 1800s. Franz Schubert used the guitar to write some of his famous works. In modern times Spanish guitarist Andres Segovia helped make the instrument extremely popular.

    In the 1930s, Les Paul began experimenting to make an electric guitar. He invented the solid-bodied electric guitar in 1946. The Gibson Guitar Company began producing its famous Les Paul Guitar in 1952. It became a powerful influence on popular music. The instrument has the same shape and the same six strings (弦) as the traditional guitar, but it sounds very different. Les Paul produced a series of extremely popular recordings that introduced the public to this music. Listen to this Les Paul recording. It was the fifth most popular song in the United States in 1952. It is called “Meet Mister Callaghan.”

    Some educators told us that more years of school could help students get higher scores on intelligence tests. That was a finding of a study of teenage males in some countries. Now, another research shows that physical activity may help students do better in their classes.

    The research comes as educators in some countries are reducing time for activities like physical education. They are using the time instead for academic（学术的）subjects like math and reading. The studies appeared between 2008 and 2014. They included more than 55, 000 children, aged 6 to 18.

    Amika Singh:“ According to the results of our study, we can conclude that being physically active is beneficial for academic performance. There are, first, Physiological explanations, like more blood flow, and so more oxygen to the brain. Being physically active means there are more hormones(荷尔蒙)produced like endorphins(内啡肽). And endorphins make your stress level lower and your mood improved, which means you also perform better.”

    Also, students taking part in organized sports learn rules and how to follow them. This could improve their classroom behavior and help them keep their mind on their work.

    The study leaves some questions unanswered, however. Ms. Stash says it is not possible to say whether the amount or kind of activity affected the level of academic improvement. This is because of differences among the studies.

    The researchers said they found only two high-quality studies. They needed more high-quality studies to confirm (证实) their findings. They also pointed out that “results for other parts of the world may be quite different.”

    Still，the general finding was that physically active kids are more likely to do better in school. Ms. Singh says schools should consider that finding before they cut physical education programs. Her paper on “Physical Activity and Performance at School” is published in the Archives of Pediatric and Adolescent Medicine.

    If you thought helicopter parents were too much, wait till you learn about “lawnmower (割草机) parents”. These are the next generation of helicopter parents, who take over-parenting to the next level. Rather than staying overhead in the air, these parents actively prepare the way for their children to succeed, cushioning every bump along the way.

    Their goal is to create a soft, even surface onto which their child will proceed, free from harm and worry. They get involved before problems reach their child, sometimes even going to immoral lengths, such as writing college papers for a child who's running out of time.

    One teacher told the Irish Times: “These days you would often hear from a mother or father insisting their child be put in the top math class, for example. Self-esteem (respect) is the buzzword (popular word). They feel it would harm their child's confidence. The irony is their self-esteem would be damaged far more by sending them into a class where they can't catch up with others.

    It's not children who are out of control. It's parents. There will come a point when these children won't have parents on which to depend, and then how are they going to function? It's frightening, too, to imagine these children becoming adults and attempting to raise families of their own. They would hardly be capable of teaching independence, confidence, work ethic, and discipline to their own children if they've never learned it themselves.

    At the end of the TIME article, Gibbs shared a wonderful quote from writer D.H. Lawrence, written in 1918: “How to begin to educate a child. First rule: leave him alone. Second rule: leave him alone. Third rule: leave him alone. That is the whole beginning.

    The sixth mass extinction of life on the Earth is unfolding more quickly than feared, scientists have warned. More than 30 percent of animals with a backbone — fish, birds, amphibians, reptiles and mammals — are declining in both range and population, according to the first comprehensive analysis of these trends.

    Around a decade ago, experts feared that a new range wipeout of species was appearing. Today, most agree that it is underway — but the new study suggests that the die-out is already growing fast.

    The loss of biodiversity has recently accelerated. Several species of mammals that were relatively safe one or two decades ago are now endangered, including cheetahs, lions and giraffes, the study showed.

    There is no mystery as to why: our own ever-expanding species — which has more than doubled in number since 1960 to 7.4 billion — is eating, crowding and polluting its planetary cohabitants out of existence. By comparison, there are as few as 20,000 lions left in the wild, less than 7,000 cheetahs, 500 to 1,000 giant pandas.

    The main drivers of wildlife decline are habitat loss, over-consumption, pollution, other species, disease, as well as hunting in the case of tigers, elephants, rhinos and other large animals prized for their body parts.

    Climate change is thought to become a major threat in the coming decades, with some animals — most famously polar bears — already in decline due to rising temperatures and changing weather patterns.

    As most of us know, talking and listening don't go smoothly every time. Will parents take you seriously, believe what you say, listen to and respect your opinions? {#blank#}1{#/blank#} But some of what happens depends on you, too. Since communication is a two-way street, the way you talk can influence how well a parent listens and understands you. So here are some guidelines to consider when talking to parents:

    Be clear and direct. Be as clear as you can about what you think, feel, and want.{#blank#}2{#/blank#} They can listen better or be more helpful if they understand what you mean and what's really going on.

    Be honest. If you're always honest, a parent will be likely to believe what you say. If you sometimes hide the truth or add too much drama, parents will have a harder time believing what you tell them. If you lie, they'll find it hard to trust you.

    Try to understand their point of view. If you have a disagreement, can you see your parents' side?{#blank#}3{#/blank#}Telling parents you understand their views and feelings helps them be willing to see yours, too.

    Try not to argue or complain. Using a tone that's friendly and respectful makes it more likely parents will listen and take what you say seriously.{#blank#}4{#/blank#}If you think your emotions might get the better of you, do something to blow off steam before talking: Go for a run. Cry.{#blank#}5{#/blank#} Do whatever it takes to sound calm when you need to.

A. Hit your pillow.

B. If you can, say so.

C. A lot depends on your parents.

D. Think twice before you make a decision.

E. Your parents won't always see things your way.

F. Give details that can help parents understand your situation.

G. Of course, this is hard for any of us when we're feeling heated about something.

The Internet has the power {#blank#}1{#/blank#} (connect) people across the world to a single shared community. We can achieve almost anything online—with access to the Internet come some truly life-changing advantages. One of the greatest {#blank#}2{#/blank#} (advantage) of the Internet lies in the quick and easy access to {#blank#}3{#/blank#} huge amount of information. The Internet has now become the first place {#blank#}4{#/blank#} the majority of people turn to for information. Meanwhile, it has also made our lives unbelievably {#blank#}5{#/blank#} (convenience), with all sorts of goods and services {#blank#}6{#/blank#} (provide) bye-commerce. Above all else, the Internet helps us establish and maintain social ties. However, {#blank#}7{#/blank#} the Internet brings many valuable advantages, being connected has its problems. We must be aware {#blank#}8{#/blank#} these problems and be careful to use the Internet {#blank#}9{#/blank#} (proper) and responsibly. Only in this way can we enjoy the immeasurable benefits of the Internet. When {#blank#}10{#/blank#} (use) safely, the Internet can be a place of discovery, wonder and inspiration for everyone.