20分钟英文演讲ppt

推荐以下主题，有范文，还是要适当修改哦~1.文化冲击（经典主题）ModuleRecent years have witnessed an increasing number of people going abroad for academic or business reasons. Many of them experience culture shock, or the difficulty to adjust to a new culture that differs from their own. In this essay, an endeavor is made to probe into the causes and effects of this shock and render some suggestions to minimize it.In a multi-cultural context, culture shock, as the psychological (and sometimes physical) discomfort, is usually caused by unsuccessful encounters with the members of another culture. Many factors contribute to it- smells, sounds, flavors, the very feeling of the air one is breathing. Of course, the natives' unfamiliar language, behavior and different rules of social interaction trigger it as well. It is true that once outside of their own culture, the vast majority of cross-cultural visitors may begin to realize that there is a common uncertainty among them, as foreigners. Subsequently, this uncertainty and shock can sometimes affect their emotional, behavioral and psychological ability to think and function, possibly leading to unpleasantness, frustration, loneliness and insularity along with the confusion and disorientation.As culture shock is caused by multifaceted factors and potentially harmful to a person's wellbeing, its effects can be mitigated properly. Here are a few remedies that work for most people. Firstly, you should prepare for international travel by learning cultural values, customs, traits and the new language before hand.Secondly, find common interest within the new culture and develop an active hobby (tennis, volleyball ping pong) that will offer an outlet to release the feelings of disorientation, frustration and confusion. In addition, try to travel around to historical sites or familiar places within the culture in order to establish contact with local people or tourists.In conclusion, it is clear that because of the different thinking style and lifestyle, going abroad is easy to make international travelers suffer culture shock. If left untreated, it can lead a "culture crosser" to reject the inhabitants of the new country and isolate him or her from contact with locals. Therefore, people should be fully culturally prepared to deal with the perils of culture shock before setting foot on a different land.2.身体健康方面（关注不同角度，比如儿童肥胖问题ModuleChildhood obesity is already epidemic in some industrialized countries and on the rise in China. It is estimated that approximately 30 percent of children and teenagers in Beijing are overweight, 10 percent of whom are obese. There is convincing evidence that overweight or obesity may result in a host of health conditions. The prevalence of obesity in children has become a focus of public interest,What lies behind the prevalence of teenage obesity?Some research suggests that the increased incidence of obesity in children and adolescents stems from a variety of factors, including physical inactivity, sedentary behavior, heredity, eating habits and environmental factors. As we all know, modern technology and changes in lifestyle have created a society where people are becoming less physically active and increasingly sedentary. Some children indulge in inactive leisure pursuits, for example, TV viewing, net-surfing and gaming. Genetics are another major contributing factor. Just as the old saying goes, "Like father, like son." If parents are both overweight, their children have 80 percent chance of becoming overweight. An increase in the consumption of high fat and high energy foods is likely to be foremost among the causes of the current epidemic.What can we do to combat childhood obesity? There is a simple solution to the prevailing weight problem--eating a balanced diet and leading a physically active lifestyle. Children should be encouraged to try to eat a variety of foods, especially pasta, rice, bread, and other whole-grain foods, apart from plenty of fruits and vegetables. At the same time, the time spent in sedentary activities, e.g. watching TV, playing video and computer games should be decreased, We should always keep in mind that physical activity is important for physical health, emotional well-being, and achieving a healthy weight,In conclusion, for most children who are overweight or obese, the safest and most effective way to lose weight and keep it off over time is to eat less and exercise more.3.教育问题（结合最新发生的事件进行论述）ModuleIn the last several years the impact of video games, both positive and negative, on children has been a subject of both heated debate and scientific research. In this essay, I will examine both sides of the argument and establish my own standpoint.Some scientists argue that video games can have a positive influence on children. For example, they may be a friendly way of introducing children to computers, and stimulate children s curiosity and interest in the computer science, which leads to discovery and creativity. Besides, they may increase children's hand-eye coordination and attention to detail. In other words, gaming develops adaptability and flexibility. Also, researchers have found that the games can provide opportunities for achievement,freedom and even a connection to other players. Undoubtedly, playing with friends can be an enjoyable social interaction.On the other hand, scientific research has shown that playing video games may affect some children's physical functioning. Effects range from triggering epileptic seizures to causing heart rate and blood pressure changes.Furthermore, numerous studies suggest that playing a lot of violent video games is related to having more aggressive thoughts, feelings, and behaviors. Ample evidence also shows that spending large amounts of time playing these games can create problems and lead to poor social skills and lower grades. In addition, they can also be quite addictive, which is detrimental to children who lack self-control and self-discipline.While video games can be valuable learning tools, they also have some adverse effects. Regarding content, educational games are likely to have positive effects and violent games are likely to have negative effects. The point is that, in this new age of technology, children are spending much more time playing video games and watching television. And many of the video games contain some violence.Therefore, for decreasing the negative impact that gaming might have on children, parents should be most concerned about two things: the amount of time that children spend, and the content of the games that they play.Video game addiction has become a focus of public interest. Numerous studies suggest that heavy gaming exerts disastrous effects on children' s healthy growth and therefore some researchers and scholars propose that teenagers should not be allowed to play PC games, While l admit that computer games have a negative impact on the development of children, especially contributing to aggressive and anti-social behaviour, I still feel that it is irrational and impractical to ban video games.To start with, PC games may be a friendly way of introducing children to computer science. Playing computer games arouses curiosity, which leads to discovery and creativity, Some video games may promote learning, problem solving and help with the development of fine motor skills and coordination.Moreover, social skills are learned while children are enjoying various games. That is to say, playing computer games has become a way of associating with friends from all over the world. After all, playing with friends can be an enjoyable social interaction.Thirdly, playing computer games helps fulfill certain psychological needs, By this I mean, video games area useful outlet for childhood aggression because play allows kids to express feelings and impulses that have to be carefully held in check in their real-world interactions.In the final analysis, it is clear that the benefits of video games far outweigh the risks. I firmly believe that children should be encouraged to play computer games with adequate parental guidance because playful discovery is a doorway to learning.

I have one is talk about obesity.