Social media has given rise to a cool phenomenon called “selfie（自拍）”. It refers to a picture of yourself, usually shared on any social networking website.

【小题1】 Some selfies are extreme close-ups（特写镜头）, and others show part of an arm held straight outward. A few of them even feature the subject standing in front of a bathroom mirror.

Everyone takes selfies, but the younger crowd seem to be especially involved in the trend. Young people are relatively heavier digital users. They are interested in staying connected to their friends. 【小题2】.

There are also kinds of psychological（心理的）factors driving people to take a selfie and upload it to a social networking site. 【小题3】 A quick and easy way to attract attention from others is to get “likes” and comments from friends. Secondly, it’s human nature to show off your own great achievements. When you feel good about yourself or look good, it’s far too easy to take out your phone and record it all through one or several selfies. 【小题4】 That’s right. Sometimes people are bored at work, bored at school, bored at home and even bored on the toilet. Last but not least, social media is about being social! If that means uploading as many selfies as possible, then so be it. It’s fun, and it’s a cool way to record your own life.

Finally, there are things to be careful about when you’re posting selfies. It’s easy to think you’re sharing a photo with a few people. 【小题5】 So don’t post anything online, the selfie especially.

The art of public speaking began in ancient Greece over 2,000 years go. Now, twitter, instant messaging, e-mail, blogs and chat forums offer rival approaches to communication - but none can replace the role of a great speech.

The spoken word can handle various vital functions: persuading or inspiring, informing, paying tribute, entertaining, or simply introducing someone or something or accepting something. Over the past year, the human voice has helped guide us over the ups and downs of what was certainly a stormy time.

Persuasion is used in dealing with or reconciling different points of view. When the leaders met in Copenhagen in December 2009, persuasive words from activists encouraged them to commit themselves to firmer action. Inspirational speeches confront the emotions. They focus on topics and matters that are close to people's hearts. During wars, generals used inspiring speeches to prepare the troops for battle.

A speech that conveys knowledge and enhances understanding can inform us. The information must be clear, accurate, and expressed in meaningful and interesting way. When the H1N1 pandemic（流行病）was announced, the idea of "swine flu" scared many people. Informative speeches from World Health Organization officials helped people to keep their panic under control so they could take sensible precautions.

Sad events are never easy to deal with, but a speech that pays tribute to the loss of a loved one and gives praise for their contribution can be comforting. Madonna's speech about Michael Jackson, after his death, highlighted the fact that he will continue to live on through his music.

It's not only in world forums where public speaking plays an important role. It can also be surprisingly helpful in the course of our own lives.

If you're taking part in a debate you need to persuade the listeners of the soundness of your argument. In sports, athletes know the importance of a pep talk（鼓舞士气的讲话）before a match to inspire teammates. You yourself may be asked to do a presentation at college or work to inform the others about an area of vital importance.

On a more personal level, a friend may be upset and need comforting. Or you might be asked to introduce a speaker at a family event or to speak at a wedding, where your language will be needed to move people or make them laugh.

Great speaking ability is not something we're born with. Even Barack Obama works hard to perfect every speech. For a brilliant speech, there are rules that you can put to good use. To learn those rules, you have to practice and learn from some outstanding speeches in the past.

Jon Hoffman was sitting at a red light when he saw a man run out of a store carrying a plastic donation jar full of cash. The Plano, Texas, detective# dressed in plain clothes but wearing his badge and gun, caught the man and pinned him to the hood of his car. But Hoffman had trouble containing the thief, and they got into a struggle.

“The detective has a martial (军事的) arts background, and he said he thought the suspect must have a martial arts background, too, because he was able to break away so easily,” a Plano police spokesperson said.

The detective called out for help as a crowd gathered. Among those watching: Andre Harvey and Kirby Sample, two day laborers. Harvey did what has become common these days—he took out his phone and hit record. “I hate to say it, but I thought that this policeman was doing something stupid,” Harvey said. “But when he asked for help, I thought, well, there won’t be a shooting if I get over there in time.” Harvey jumped into action —while he was still recording the video—as did Sample.

“Harvey caught hold of the suspect’s arms, while Kirby seized his legs, and they were able to get the suspect to the ground to help Detective Hoffman put the handcuffs (手铐)on,” said the police spokesperson. The 27-year-old suspect was charged with resisting arrest and other offenses. The charity jar he stole held less than $ 50.

“I’ve been on the wrong side of the law several times in my life,” Harvey told WFAA. “It feels good to be on the right side and do something positive.”

After the arrest, the three men got to know each other over steaks and ribs at a local steak house — Hoffman’s treat, as a thank-you. But the rescuers say Hoffman deserves credit too. “It could have turned real ugly,” Sample told KFOR. com. “He handled himself like a real professional.”