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    Is there link between humans and climate change or not? This question was first studied in the early 1900s. Since then, many scientists have thought that our actions do make a difference. In 1997, the Kyoto Protocol explained our role in the Earth's changing atmosphere and set international limits for gas emissions(排放) from 2008 to 2012. Some countries have decided to continue these reductions until 2020. More recently, the Paris Agreement, stuck by nearly 200 countries, also aims to limit global warming. But just now how much warmer it will get depends on how deeply countries cut carbon emissions.

    In 1880, fourteen-year-old Matthew Henson loved to hear sailors tell tales of their exciting lives at sea. The travel, the adventure, the danger, and the steady pay were all attracting young Henson. One day, he found a job as a cabin boy on a beautiful ship called the Katie Hinds. For the next five years, Henson sailed around the world. With the help of the ship's captain and other members of the crew, Henson learned mathematics, navigation, history, geography, and many other subjects. By the time he left the Katie Hinds in 1885, Henson was well educated and had become an excellent seaman.

    Unable to find work anywhere else, Henson took a job in a hat shop in Washington, D.C. One day in 1887, a man came in to buy a hat. The man, Robert Peary, asked the owner if he knew anyone with experience at sea. Peary would soon travel to South America for the U.S. government. He needed experienced men to accompany him. The shop owner knew about his young employee's skills and experience on ocean journeys, so he introduced Peary to Henson.

    Using his map-reading and sailing skills, Henson proved himself to be a worthy and smart seaman. Peary soon made Henson his assistant（助理）, and they became close friends. One day Peary told Henson about his real dream: to be the first man to stand on “the top of the world” at the North Pole. He asked Henson to help him make his dream come true. Over the next five years, the two explorers made two trips together to the Arctic. However, they were not able to reach the pole either time. The cold, wind, and ice were worse than either of them had ever imagined.

    In 1908, Peary and Henson were ready to make their final attempt at reaching the North Pole. Both men were over forty years old. The years of hardship in the arctic cold had made them suffer a lot. This would be their last chance. With four Inuit（因纽特）guides, they made a mad rush straight across the ice toward the pole. Peary's feet were injured and he had to be pulled on a dogsled. In April 1909, Henson's instruments showed they were standing at the North Pole. Together Henson and Peary planted the American flag in the snow.

    In later years, Robert Peary and Henson were greatly honored for their achievements. Today, the two friends and fellow explorers lie in heroes' graves not far apart in the Arlington National Cemetery.

    Are you afraid of moving up to senior high school? It is a completely new experience, but you shouldn't worry. We've got a guide to help you.

    You're not alone. Remember that everybody else in your year is in the same boat. You may not notice it, but they're just as nervous as you are.

    Moving to senior high school is a chance, not a problem. Things are different, and all you need to do is to be polite and learn the new rules.

    The teachers will help. If you don't know what to do or are worried about something, then ask for help. Teachers are probably the best people to turn to, because they have experience in helping new students. Pay attention to what your teachers say.

    Everything changes. There are lots of differences between junior high school and senior high school. You will have your lessons with different teachers in different rooms. You will have homework for different subjects on different days, so make sure you get organised. Make sure you know which rooms your classes are in and which days you have your different subjects on.

Other points:

    If you've got an older brother or sister at the school, then ask them for advice.

    Be yourself! It sounds simple, but things will become better if you just act naturally.

    Having early nights makes a difference. You'll also find it easier to get up in the morning!

    My two- and four-year-old boys love to win, whether they're racing their bikes down the sidewalk or just finishing their snacks. It's true that those with high status, from world leaders and prize winners to athletes and movie stars, are people we like and respect. A recent study published in Nature Human Behaviour showed that we seem to have an innate (天生的) preference for high-ranking peoples—but only if those people aren't hurtful toward others.

    Researchers showed toddlers (aged 21 to 31 months) a scene where two puppets (木偶) approached one another from opposite sides of a stage and one bowed to let the other pass first. Asked which puppet they liked better, 18 of the 21 toddlers in the experiment reached for the puppet who had been allowed to pass. Because respect from others is a marker of status, this suggests that children have a preference for those with a higher status—even before age three.

    However, the results were quite different when two puppets approached one another and one used force to knock the other down before continuing to the other side. In this case, 18 of the 21 toddlers reached for the one who was knocked down. As the researchers concluded, "When approaching others, very young children care not only who wins, but also how." The previous experiment has shown that toddlers know about social status, but this experiment went one step further by proving they have an obvious preference for high status. Since the participants were so young, this might even be an innate human preference.

    In a word, this new research suggests that young children appreciate people who do well while at the same time doing good to others. So, when my four-year-old thinks that he has to get his shoes on first, I'll keep reminding him that helping his brother so they both finish faster is what winning is all about.

Being a good parent requires providing a child with the gifts of love, attention, energy, and resources unstintingly over a long period of time. It involves developing a small body, but it also involves growing a child's soul.

Parents are an enormously powerful force in the lives of children. Whether Johnny can read, whether Johnny knows right from wrong, whether Johnny is a happy, well-adjusted kid, or sad and self-destructive, has a whole lot to do with the kind of parenting Johnny has received. If Johnny's mom and dad have been able to come through with lasting, loving attention, the chances are that Johnny is on track to become a productive, compassionate (富有同情心的) person. If they have not, Johnny is in trouble.

Thirty years ago Chicago professor James S. Coleman showed that parental involvement mattered far more in determining school success than any quality of the formal education system. Across a wide range of subject areas, in literature, science and reading, Coleman estimated that the parent was twice as powerful as the school in determining achievement at age fourteen. Psychologist Lawrence Steinberg, who recently completed a six-year study of 20,000 teenagers in nine different communities, confirms the importance of parents. Steinberg shows that one out of three parents is "seriously disengaged" from his or her adolescent's education, and this is the primary reason why so many American students perform below their potential and below students in other rich countries.

A weight of evidence now demonstrates obvious links between absentee parents and a wide range of behavioral and emotional problems in children. A 1997 study of 90,000 teenagers — the Add Health Project undertaken (承担) by the Carolina Population Center and the Teenage Health Program at the University of Minnesota found that youngsters are less likely to get depressed, use drugs or become involved in crime when they spent significant time with their parents. This study found that the mere physical presence of a parent in the home after school, at dinner and at bedtime significantly reduces the incidence of risky behavior among teenagers.

About two years ago, Coronavirus(新冠病毒) showed up(出现). So many great people are fighting it to protect(保护) us. One of them is Zhong Nanshan. He's 84 years old, but he's still fighting the virus. Thanks to them, China is getting better(情况好转). But this virus is really dangerous. We must be careful all the time. Here are some ways to protect ourselves.

Wear a face mask(口罩).

Wash your hands often.

Don't touch your face, eyes, nose and mouth before washing your hands.

Do some exercise to keep healthy.

China is a very big and old country. Over 5, 000 years, we faced many problems. Fighting this virus is just another one of those problems. At last(最终), we will win.