The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid—we simply weigh too much, and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink.

    However, several types of animals can walk on water. One of the most interesting is the common basilisk Basilicus basilicus, a lizard (蜥蜴)native to Central and South America. It can run across water for a distance of several meters, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we，d need huge feet that we could bring up to our ears in order to create adequate w hitting.

    But fortunately there is an alternative : cornflour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a “non-Newtonian” liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子）in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick Liquid of cornflour.

    Fun though all this may sound, it's still rather messy and better read about in theory than carried out in practice. If you must do it, then keep the water wings handy in case you start to sink--and take a shower afterward!

    Food production does great harm to our environment. There are many procedures involved in the manufacture of food that result in greenhouse gases and other pollutants. Some procedures require the consumption of large amounts of fossil fuels, such as the transportation and storage of food products. Other factors that cause great damage to our environment include the overuse of fresh water.

    The production of beef is more damaging to the environment than that of any other food we consume. Raising large numbers of cattle requires the production of large amounts of food for the animals. It's estimated that producing one pound of beef requires seven pounds of feed.

    Land use is also a problem. If the cattle are free-range cattle, large areas of land are required for them to live on. This has led to disastrous forest cutting and the loss of rare plants and animal species, particularly in tropical rain forests in Central and South America.

    Another problem specific to beef production is methane emissions (甲烷排放). Although many people are aware of the damaging effects of carbon dioxide, they don't realize methane's global warming potential is 25 times worse, making it a more dire problem.

    Unfortunately, beef consumption is growing rapidly. This is the result of simple supply and demand factors. Specifically, there are two main causes of demand that are encouraging the production of more supply. First, the increase in the world population means there are more people to consume meat. The second factor is socioeconomic advancement. As citizens in developing nations become financially stable, they can afford to buy more meat.

    Therefore, one way to reduce the greenhouse gas emissions is for people around the world to significantly cut down on the amount of beef they eat.

    You probably know you should say” please” and “thank you ” at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have music manners?

    Keep It Down! You have to notice the volume of your music. You should not play your music so loud that everyone around you can hear it. Some people might even get angry. Usually, when you play the music loud on an MP3 player, other people can't hear the words of the song. They just hear a loud sound. Not one wants to listen to this. Very loud music can also be bad for your ears, so even if you are alone when listening to our MP3 player, you shouldn't have it turned up too high.

    Take Them Off! You need to know when to turn your MP3 player off and put it away. Libraries and schools don't allow MP3 players. There are other places, like museums, that don't have rules, but it would be rude to have your MP3 player on. Sometimes, it just doesn't make sense（没意义） to listen your MP3 player at event. Why would you listen to music at a play, a movie or a sporting event? You would miss what is going on and others would wonder why you even came.

    Take One Out! Once in a while it's okay just to take out one earphone and not the other. Imagine you are listening to your MP3 player when someone asks you the way. It would not be rude to take out one earphone, tell him the way, and put back the earphone and continue listening. You can also do this when you order food at a fast-food restaurant.

    It's Your Choice! There are times when you need to decide what is best. For example, some people can listen to music on their MP3 Players when read books, while others think it is disturbing. In cases like this, you need to do what seems right for you.

                                                                                    How Can I Fight Laziness?

    Lazy people will never gain anything in life. However, laziness can be defeated once a few changes have been made in your mind.

    {#blank#}1{#/blank#}Many people lack sleep constantly, since they stay up too late and get up too early to prepare for work. These people have little motivation once they arrive home. Laziness works hand in hand with a lack of motivation and a tendency to put off things. By adjusting your sleep schedule to provide a few more hours of meaningful rest, you can fight laziness throughout the day.

    Another way to fight laziness is to change your mind from passive to active. Some people treat their lives as if they were pushed from task to task. Others take a more positive approach, viewing each task as a challenge they must overcome alone.{#blank#}2{#/blank#}

    Some people fight laziness by removing the temptations(诱惑) that surround them. A television in the living room may provide entertainment, but watching too much TV often contributes to laziness.{#blank#}3{#/blank#}Complete a few tasks and reward yourself with a good dinner.

    Laziness can also be a lasting problem at home. Couples and children may all have different energy levels, but laziness can be spread if not dealt with immediately.{#blank#}4{#/blank#} Be the first to collect and wash dishes after a meal. Others in the home may eventually follow your example and perform their own task. It is difficult to practice laziness when you are surrounded by motivated people.

    {#blank#}5{#/blank#} Enough exercise and a balanced diet can help you to develop a healthy lifestyle, thus enabling you to have more energy and help lift your spirits.

A. To fight family laziness, set an example.

B. Knowing how to fight laziness is important.

C. One way to fight laziness is to get enough sleep.

D. Finally, taking exercise regularly can help you fight laziness.

E. With strong determination, you will be able to achieve your goal.

F. Laziness appears when you no longer feel in charge of your own mind.

G. Create a reward system for yourself, just as parents do for a child.

    It is not only praise or punishment that determines a child's level of confidence. There are some other important ways we shape our kids—particularly by giving instructions and commands in a negative or positive choice of words. For example, we can say to a child "Don't run into traffic!" or "Stay on the footpath close to me." In using the latter, you will be helping your kids to think and act positively, and to feel competent in a wide range of situation, because they know what to do, and aren't scaring themselves about what not to do.

    Actually, it is all in the way the human mind works. What we think, we automatically rehearse. For example, if someone offered you a million dollars not to think of a blue monkey for two minutes, you wouldn't be able to do it. When a child is told "Don't fall off the tree," he will think of two things: "don't" and "fall off the tree". That is, he will automatically create the picture of falling off the tree in his mind. A child who is vividly imagining falling off the tree is much more likely to fall off. So it is far better to use "Hold on to the tree carefully."

    Clearly, positive instructions help kids to understand the right way to do things. Kids do not always know how to be safe, or how to react to the warning of the danger in negative words. So parents should make their commands positive. "Sam, hold on firm to the side of the boat" is much more useful than "Don't you dare to fall out of the boat?" or worse still "How do you think I'll feel if you drown?" The changes are small but difference is obvious.

    Children learn how to guide and organize themselves from the way we guide them with our words, so it pays to be positive.

    This summer, when earthquakes rocked Southern California on back-to-back days, it was a close-to-home reminder that we may one day experience the "Big One," a quake with the power to kill and destroy. A few people, however, saw something else: a photo opportunity. Tourists poured to a large crack in a highway to see evidence of the damage for themselves and, of course, take a quick selfie.

    {#blank#}1{#/blank#} It feeds so many of the weakest parts of ourselves: our born attraction to images of human faces instead of landscapes or objects, our interest in capturing memories, and yes, our need for social approval. Yet, it is easy to feel uncomfortable with selfies and even laugh at them, especially when they are risky or in bad taste. So why do we take selfies?

    Selfies have become so common that my grandma does them when we get together. {#blank#}2{#/blank#} Instead, selfies are a way for us to connect and communicate, and feel a more personal connection with people all around the world.

    In one example, researchers developed a #ScientistsWhoSelfie campaign studying how scientists posting photos of themselves with their work on social media influenced public opinion of the profession. {#blank#}3{#/blank#} "Those scientists in general were described as warmer, but no less competent," said Paige Jarreau, the lead author on the study.

    While some scientists refused at first, fearing that their colleagues would consider them self-centered or think they take their work less seriously, those concerns disappeared once researchers explained that it could help build public trust. "This is not just me taking a duck-faced (嘟嘟嘴) selfie or trying to look cute on camera," said Dr Jarreau. "This is me being able to better tell the story about my science in a way that helps people trust me."

    {#blank#}4{#/blank#} Dr Jarreau recalled a road trip she made to national parks, where she witnessed so many people taking selfies, she began taking photos of the selfie-takers themselves. "Ask yourself: Why are you posting that picture?" she said. "If there was a platform that didn't enable likes, would you post it?" After all, there are other ways to develop a social connection. You could send the photo to a private group. You could put it in a frame at home. You could be mindful in the moment by not taking it at all. {#blank#}5{#/blank#}

A. But if you do, watch your step.

B. There is no denying the draw of the selfie.

C. With each like, we feel better about ourselves.

D. The thought that selfie is the symbol of self-love is outdated.

E. However, most of us post mechanically, even madly, in our daily lives.

F. After all, people have been making self-portraits for long, in remarkably similar ways.

G. They found that photos with human faces helped improve impressions in a field that is often subject to negative stereotypes.