Cheating can happen in a lot of different ways. When people cheat, it's not fair to other people, like the kids who studied for the test or who were the true winners of a game.

Many people like the action of cheating. It makes difficult things seem easy, like getting all the right answers on the test. But it doesn't solve the problem of not knowing the material and it won't help on the next test — unless the person cheats again.

    Some people lose respect for cheaters and think less of them. The cheaters themselves may feel bad because they know they are not really earning that good grade. And, if they get caught cheating, they will be in trouble at school, and maybe at home, too.

    Some kids cheat because they're busy or lazy and they want to get good grades without spending the time studying. Other kids might feel like they can't pass the test without cheating. Even when there seems to be a “good reason” for cheating, cheating isn't a good idea.

    If you were sick or upset about something the night before and couldn't study, it would be better to talk with the teacher about this. And if you don't have enough time to study for a test because of swim practice, you need to talk with your parents about how to balance swimming and school.

    A kid who thinks cheating is the only way to pass a test needs to talk with the teacher and his or her parents so they can find some solutions together. Talking about these problems and working them out will feel better than cheating.

    With their furry round heads and big black eyes, Zhongzhong and Huahua look just the same as any other monkey. But they happen to be the world's first cloned (克隆的) monkeys.

    Years ago, scientists used cloning techniques to produce Dolly, the world's first cloned mammal (哺乳动物).They now used the same technique to produce the monkeys in China.

    In animal cloning, animals are produced in a lab by using DNA that is taken from the cells (细胞) of a naturally-born animal. To clone Zhongzhong and Huahua, scientists from the Chinese Academy of Sciences (CAS.中国科学院) first removed the nucleus (细胞核) from a monkey's egg cell (卵细胞). They then put another nucleus taken from the monkey's body cells into the egg cell. The newly-formed egg was put into the womb (子宫) of a female monkey. Finally, Zhongzhong and Huahua were born.

    The cloning process is hard, especially removing nucleus. It needs to be done in a fast and precise (精确的) way. The faster you do it, the less damage is done to the egg, according to CAS. Scientist Liu Zhen spent three years practicing removing the nucleus.

    Unlike common monkeys, cloned monkeys have the same DNA as each other. When doing experiments on them, scientists can easily know that certain results are caused by different treatments, rather than different genes.

    According to Sun Qiang from CAS, most drug trials (药物试验) are done on lab mice. However, drugs that work on mice might not work on humans. The two species are very different.

    "Monkeys and humans are much closely related and testing on monkeys is supposed to be as effective (有效的) as testing on humans," Sun added.

    Body language is the quietest, secretest and mostpowerful language of all! It is said that our body movements communicate about 50 percent of what we really mean while words only express 7 percent. So, while your mouth is closed, your body is just saying...

    Arms. How you hold your arms shows how open and receptive you are to people you meet. If you keep your arms to the sides of your body or behind your back, this suggests you are not afraid of taking on whatever comes your way. Outgoing people generally use their arms with big movements, while quieter people keep them close to their bodies. If someone upsets you, just cross your arms to show you're unhappy!

    Head. When you want to appear confident, keep your head level. If you are a monitor in class, you can also take on this position when you want your words to be taken seriously. However, to be friendly in listening or speaking, you must move your head a little.

    Legs. Your legs tend to move around a lot more than normal when you are nervous or telling lies. If you are at interviews, try to keep them still!

    Posture (姿势). A good posture makes you feel better about yourself. If you are feeling down, you normally don't kit straight, with your shoulders inwards. This makes breathing more difficult, which can make you feel nervous or uncomfortable.

    Mouth. When you are thinking, you often purse your lips. You might also use this position to hold back an angry comment you don't wish to show. However, it will probably still be noticed, and people will know you're not pleased.

    Face. When you lie, you might put on a false face. But that expression would crack briefly, allowing displays of true emotions such as happiness, sadness, disgust(厌恶)and fear to come through.

    Nola (August 21, 1974-November 22, 2015)was a northern white rhino(犀牛) who lived at the San Diego Zoo Safari Park near Escondido, California. At her death, she was one of only four remaining northern white rhinos in the world. The other three lived in Kenya. World Rhino Day, held on September 2, is to raise awareness(意识) of the less than 30, 000 other rhinos left on Earth.

    "Rhinos need our help today, not tomorrow," Nola's lead keeper Jane Kennedy said. "Last year we lost over 1, 200 rhinos just in South Africa. If we continue to lose more than 1, 000 rhinos a year, in 10 to 20years all the rhinos on the planet will be gone. "

    "Unfortunately, most animals are in danger of dying out because of humans," Kennedy says. "Humans have either poached animals, or because there are over seven billion of us, we've taken up too much of the world's resources". Poachers illegally hunt rhinos for their horns. They sell the horns for thousands of dollars per pound, to be used for art, jewelry, and decorations. Experts believe that one rhino is poached every eight hours.

    In 1975, the San Diego Zoo Institute for Conservation Research started the Frozen Zoo, a program through which researchers have collected cell (细胞) samples from more than 8, 000 different types of animals, including the northern white rhino. Scientists hope that by studying the rhino cells, they will get greater understanding of it, and will find ways to increase its numbers.

    Jane Kennedy describes World Rhino Day as "a celebration of rhinos along with an awareness campaign(活动)for everybody across the world to know that rhinos need our help. "At the San Diego Zoo, children and adults are welcome to visit and speak with zookeepers to learn about rhinos. But you don't have to live in San Diego to celebrate World Rhino Day. It is observed around the world, with zoos and wildlife parks holding special events and programs to teach people about rhinos, and enable them to see the animals up close. For more information, go to www. worldrhinoday.org.

American country music is also known as country western music. It has a very long history. It comes from the folk songs of immigrants (移民) from Britain.

 Country music uses simple music and words to express everyday feelings such as loneliness, love, and sadness. That is to say, country music describes life. It talks about friends and enemies, trucks and roads, farm and crops. People in many parts of the world like country music, because everyone can understand what the music is about.

Country western music became popular first among cowboys (牛仔) in the American west countryside. Cowboys had to take care of cows day and night. When they were alone with the cows, they often sang beautiful and peaceful songs to calm the animals and to overcome their own fear. They were not well-educated and so they sang about their daily life in very simple words. They played guitars, violins and other instruments. In the south of America, many people added instruments from their homes, like bottles and spoons. When cowboys visited their friends and families on holidays like Thanksgiving, they usually sang and played country western music.  

In recent years, many musicians have made country western music a little different from the one in the past. These changes make the songs sound even better. Today singers such as Carth Brooks, Reba McEntire, Emmylou Harris, Lyle Lovett, Eddie Rabbitt, LeAnn Rimes, Randy Travis and a group called Alabama are singing and playing in different styles. They have brought country western music more and more fans from all over the world.

Restless in their seat, glancing around and never looking you in the eye. We think we know when someone is lying, but do we really?

A study showed that people's ability to tell if someone is lying is little better than 50%. Interestingly, another research suggests that we are actually quite good at unconsciously (无意识地) spotting liars, but our conscious thoughts overrule this. Scientist R. Edward points out that training in recognising liars doesn't always help, saying "quick, inadequate training sessions lead people to over-analyse and to do worse than if they go with their gut reactions (本能)". 

One reason for this may be "truth bias". Experts have suggested that we are usually biased to believe that people are telling us the truth. Another reason that might make us bad at identifying liars is that there are many myths around body language and lying. Many of us believe that liars are unlikely to look us in the eye or will be uneasy in their seat. However, this isn't necessarily the case. It may be that not looking away, or sitting more still than usual, are actually the giveaways that someone is lying. 

To see how someone's behaviour really changes as they lie, many experts recommend observing people talking about things known to be true. This allows us to establish a baseline of their normal behaviours while speaking. Any differences to this baseline behaviour could show that someone is lying. This is why it's much harder to lie to people who know us well.

As liars may be working hard to conceal their behaviours, some psychologists have suggested increasing the effort needed for this by asking them to tell their story again backwards. When facing this increased cognitive (认知的) load, any behavioural tell-tale signs are magnified (放大).

It can be hard to spot liars. We are likely to trust people, and behaviours can be hidden, but if we know someone well, and if someone is working too hard to stick to their story, it's possible to see through people who are not telling the truth.