第一篇：英語演講PPT范例

Ladies and Gentlemen.Good afternoon!I’m very glad to stand here and give you a short speech.My topic today is global warming.At present, humans face a serious challenge.That is global warming.Increasing global temperatures are causing a broad range of changes in the world.Sea levels are rising due to the melting of land ice.As you can see, global warming is a very serious threat to our lives，so it is important to learn more about it.Generally,global Warming is caused by two things.One is man-made, another is natural causes.One natural cause is the release of methane gas from arctic tundra and wetlands.Another natural cause is that the earth goes through a cycle of climate change.This climate change usually lasts about 40,000 years.Man-made causes probably do the most damage.There are many man-made causes.Pollution is one of the biggest man-made problems.Pollution comes in many forms.Burning fossil fuels is one thing that causes pollution.Fossil fuels ,such as coal or oil.When they are burned, they give off a green house gas called carbon dioxide.Another major man-made cause of global warming is population increase.More people mean more food, and more methods of transportation, right? That means more methane because there will be more burning of fossil fuels, and more agriculture.Another source of methane is manure.Animals like cows are raised as a source of food which means more manure and methane.Another problem with the increasing population is transportation.More people mean more cars, and more cars mean more pollution.Also, many people have more than one car.In the past few years, many workers have noted that the combined effect on climate of increases in the concentrations of a large number of exraust could rival or even exceed that of the increasing concentration of carbon dioxide.These exraust, principally methane and nitrous oxide, are present at concentrations that are two to six orders of magnitude lower than that of carbon dioxide, but are important because, per molecule, they absorb infrared radiation much stronger than carbon dioxide.Studies have shown that human activity of this century has increased the concentrations of atmospheric exraust, which in turn has elevated global surface temperatures by blocking the escape of thermal infrared radiation.Natural climate variations are masking this temperature increase, but further additions of exraust during the next 65 years could double or even quadruple the present effects, causing the global average temperature to rise by at least 1 °C and possibly by more than 5 °C.If the rise continues into the twenty-second century, the global average temperature may reach higher values than have occurred in the past 10 million years.However, assessment of ongoing and future climate change requires long-term global monitoring of aerosol properties.So there is a need and opportunity for global cooperation in technology development.Only by doing so that we can better live in this planet.Thank you!

第二篇：英語演講ppt

Good morning everyone!I?m pleasure to be on the stage and bring you a speech!And my topic is we are young.Last week we have learned an article by Bertrand Russell.these is a sentence touched to me.“Most people ,when they are left free to fill their own time according to their choice , are at a loss to think of anything sufficiently pleasant to be worth doing.” I fell into deeply thought because sometimes I will face this situation too.Then I thought why.why I am the most people ? Suddenly , Some words appear in my mind.“ Youth is the season of dreams of flying!” Yes , we are young!Our mind should be filled with dreams and know where is our dream , how to achieve her!But why I am not!Perhaps there is so much temptation in our life that we will be disoriented.But now I know we are young and the dreams of youth are invincible!Imagine this , if we have a dream and know where is her , how to get her.Are we still don?t know what we should do ? So , do you have think about this problem ? Let me give you a few examples to look at how others treat their dreams.Arnold Schwarzenegger , everyone knows him.he is the one knows what he really wants.When he is a 15 years old boy , he want to be the champion of world bodybuilder.Then , He train himself five hours a day.At 20 years old, he became the youngest ever word bodybuilder champion.Then he wants to be a actor.But everyone told him it?s impossible.they said: Are you kidding me.Hear your accent, as long as you have the strange accent, you can?t be an

actor.But he is never give up!He also spent five hours a day in actor courses, pronunciation courses ,remove accent course and so on.All the things you can imagine, he have to do.Finally, he did!he get more than $ 30 million paycheck in the film “Terminator III”, the highest in the history of the paycheck.He knows what is him realy want at every stage of his life.Now he is the governor of California.Next he may want to be the President of America.There are a lot of people can also stick to their dreams like Edison , Nobel and so on.They make their life is full of surprises and wonders.So , we are young , we have more time to create more wonders than they.We don?t have nothing pleasant to be worth doing.Conversely ,there is too mach.So , Let?s calm down and think about it.What is we realy want and where is our dream ? Then hold on!that?s all , thank you very much!

第三篇：英語演講ppt

Good morning everyone!I?m pleasure to be on the stage and bring you a speech!And my topic is we are young.Last week we have learned an article by Bertrand Russell.these is a sentence touched to me.“Most people ,when they are left free to fill their own time according to their choice , are at a loss to think of anything sufficiently pleasant to be worth doing.” I fell into deeply thought because sometimes I will face this situation too.Then I thought why.why I am the most people ? Suddenly , Some words appear in my mind.“ Youth is the season of dreams of flying!” Yes , we are young!Our mind should be filled with dreams and know where is our dream , how to achieve her!But why I am not!Perhaps there is so much temptation in our life that we will be disoriented.But now I know we are young and the dreams of youth are invincible!Imagine this , if we have a dream and know where is her , how to get her.Are we still don?t know what we should do ? So , do you have think about this problem ? Let me give you a few examples to look at how others treat their dreams.Arnold Schwarzenegger , everyone knows him.he is the one knows what he really wants.When he is a 15 years old boy , he want to be the champion of world bodybuilder.Then , He train himself five hours a day.At 20 years old, he became the youngest ever word bodybuilder champion.Then he wants to be a actor.But everyone told him it?s impossible.they said: Are you kidding me.Hear your accent, as long as you have the strange accent, you can?t be an actor.But he is never give up!He also spent five hours a day in actor courses, pronunciation courses ,remove accent course and so on.All the things you can imagine, he have to do.Finally, he did!he get more than $ 30 million paycheck in the film “Terminator III”, the highest in the history of the paycheck.He knows what is him realy want at every stage of his life.Now he is the governor of California.Next he may want to be the President of America.There are a lot of people can also stick to their dreams like Edison , Nobel and so on.They make their life is full of surprises and wonders.So , we are young , we have more time to create more wonders than they.We don?t have nothing pleasant to be worth doing.Conversely ,there is too mach.So , Let?s calm down and think about it.What is we realy want and where is our dream ? Then hold on!that?s all , thank you very much!

第四篇：英語演講PPT文稿

Hello, everybody!With the development of scientific technology, our life has become the most convenient than ever before.It is not deniable that we are in the era filled with digital product.For example, we put our photos in digital cameras, we store our assignments and documents in U-disks, and we place our favorite songs in MP3 player.They are all connected and available through computers.Computers are adequately used around the world nowadays, especially college students, but we also should know that computers are overused.People spend so much time working on it, which leads to series of bad effects.I’ve been interested in the bad effects of using computers too much for quite a long time.I’ve searched on Internet and looked up related books in library on this issue.So today I will persuade you to stop overusing computers for 3 reasons.First, it will do harm to your health.Second, it is a waste of time.And third, it will make you lose some of your abilities.First, it will do harm to your health.There are 4 problems at least.According to Wendy Ghannam and Mats Gyllenberg, specialists of computers, the low-energy X-ray and low-frequency electric radiations can cause the imbalance of centered-nerve system.This will cause headache, sleeplessness and other illness.It is the first problem.And the second problem is Carpal Tunnel Syndrome.According to Tammy Crouch.It is nerve damage that results from the repetitive hand motions with constant typing.The symptoms are intense pain and lessened motor control in the wrists and hands.The third one is eyestrain and subsequent vision.According to Irvin E.Houck Center for Information Technology, they result from sitting too close or too far from a computer screen.The forth problem is the pain of body, including muscle stress and back pain.Muscle stress results from extended periods of computer use without breaks.Back pain usually comes about because the computer users don’t sit properly when working.So now that we’ve known the reasons that computers do have harm to our body and health, we move on to my second point------it is a waste of time.I’ve done a research on 51 students in English department of our school.I found on average, that only 1/6 of their time of using computer is learning, such as looking for information doing homework.The rest 5/6 is spent on chatting on line, playing computer games or searching for the meaningless websites or other things.I’ve read in the China Daily in my freshman year that a mother had to lock the computer because her son overused computer and caused the declination of his grade.So most of the people, especially young people lack the self-controlled ability, and make it become inevitable.But it hasn’t over yet.Which brings me to my third point that overusing computer make you lose some of your abilities.You are likely to get lazy and use pen less than ever after you’ve gotten a computer.According to professional women, a published magazine in China claimed that overusing computers might cause reduce of brain function and therefore recession of memory.Second, your handwriting will become worse because of lack use of your pen.Third, probably you will lose the ability of controlling the temper.A survey held by Concord Information Corporation showed that 10% of their customers would act in violence simply due to problems of computer or Internet if they have been working on it for a long time.They couldn’t help breaking the screens, crashing keyboards or mouse when their PCs went wrong.In conclusion, let me summarize my 3 points.First, I told you that overusing computers do great harm on human bodies.Second, it is a waste of time.Third, it makes you lose some of your abilities.So overusing computers is really harmful.In closing, I want to declare one thing, that is: I’m not asking you not to use computers anymore.We have to use it, because it is necessary, a need, a must, for every one of us.But when we use it, we’d better ask ourselves, whether I use it properly, whether I overuse it.Thank you.

第五篇：英語演講ppt文本

Learn to sleep

1.基因中什么決定你的睡眠類型

People always tell me that the most accomplished people in the world get up super early, working out and having meetings.It seems right.But sometimes it’s really hard to wake up.Why? There might just be part of your genes.Geneties determine how fast or slow our internal clock runs.And as a result, how closely it and our body’s functions align with the 24-hour day.Harvard Medical School says, if your clock runs fast ,you’re more likeiy to be a morning person, and if runs slow you’re a night person.In the 2012 study, scientists found a single nucleotide on the “Period 1”gene which helps control the daily behavioral clock and correlates with wake-sleep behavior.The researches found that the nucleotide base adenine is linked to someone being a morning person, while it’s base pair guanine is linked to being a night owl.So,people with AA genotype, on average, wake up earlier than people with the GG genotype.But you can have genes that tell your body all sorts of things if you want to be a day man or fighter of the night man.We called this thing a circadian rhythm.It’s a roughly 24-hour cycle controlled by the brain that tells us when to wake up, to go to sleep, and other biological processes in between.2.Does sleeping early and getting up early really help improve sleep quality? We know that the brain emits brain waves during activity.By monitoring your brain's brainwaves scientists have discovered five stages of sleep: Stage 1 Sleep In the first stage, people are conscious.For example, when you listen to boring lectures, lectures, and meetings, you fall asleep, daydream, and even fall asleep on the spot.At this point, you get to the first stage of sleep, in which our bodies begin to relax, and our breathing and heart rate begin to drop slightly.Stage 2 Sleep During the second Stage of Sleep, some scientists believe that in a sense, the brain gradually shuts down its waking activity.At this stage, it is easy to wake up.In fact, in many studies of sleep, most people who are woken up during the second phase of sleep still think they're not asleep.Most of the classes and meetings that go to sleep are basically at this stage.Deep-sleep(第三四階段)In the third and fourth stages of sleep, we have the lowest frequency of brain waves.During these two stages, we really fall asleep, so these stages are also known as deepsleep.Our blood pressure, breathing and heart rate dropped to the lowest point of the day after we entered the deep sleep phase.Our blood vessels begin to expand, and the blood that is stored in our organs goes into our muscles and nourishes and repairs them.In the book did not detail three phase and four stages of the different, I guess, is probably the two stages of different frequency, but it doesn't matter, we just need to know, this is sleeping.The fifth stage of sleep(REM sleep)is the most fascinating phase of the whole sleep process, and scientists have yet to figure out what the purpose of this phase is.Rapid Eye Movement(REM睡眠階段)The fifth stage has a technical term, Rapid Eye Movement, or REM sleep stage.In the 1950 s, a man named Nathan klein terman(Nathaniel Kleitman)scientists found that when human beings in this sleep stage, their eyes at very fast speed in each direction.He also found that when people woke up from this stage, 95 percent of people said they were dreaming before they woke up.So REM sleep is also called dream sleep.It is believed that we are generally in REM sleep.It is interesting to note that at this stage, our brain wave frequency and awake, when there is no difference between the brain and the same active during the day, so that sometimes we think dreams are so real, just don't want to wake up.To understand the regularity of these five cycles during sleep, I also need to understand that the sleep stages mentioned earlier in the sleep cycle are not only performed once during a full sleep.They occur repeatedly during sleep, which we call sleep cycles.In a sleep cycle, we repeat many times from the first to the fifth.The whole cycle is very complicated, probably something like this : The sleep period mentioned earlier in the sleep cycle is not only performed once during a full sleep.They occur repeatedly during sleep, which we call sleep cycles.In a sleep cycle, we repeat many times from the first to the fifth.The whole cycle is very complicated, probably something like that.In the sleep cycle, each sleep stage alternates, such as: 1, 2, 3, 4, 3, 2,REM,2, 3, 4, 3, 2,REM,2, 3, 4, 3, 2,REM,2, 3, 4, 3, 2,REM...It takes an average of 60 to 100 minutes per cycle, but everyone is different.There are also some details: the first sleep stage is the longest, and later, the sleep phase will be shorter and shorter, and eventually fade away.The first REM sleep phase is the shortest, and the later is longer.So, the more people wake up in the middle of the night.Compared with the quality of sleep, the proportion of several stages is approximately: 5% in the first stage, 40-50% in the second stage, 12% in the third and fourth stages, and 25% in the REM stage.The importance of sleep stages proves that if we are sleep-deprived, we can feel extreme sleepiness, nausea, headaches, muscle aches, and inability to concentrate during the day.When we don't sleep regularly, our bodies pay for sleep at the expense of other sleep stages.Sleep is the first stage of sleep that our bodies need to meet as much as possible, so we rarely lack this stage of sleep.Our immune system is activated during sleep and fights disease.That's why we're so sleepy when we're sick, and doctors suggest we stay in bed as much as possible when we're sick.The importance of REM sleep stage although scientists are not clearly know what is the purpose of this phase, but research suggests that if we lack of REM sleep during the day we will meet some difficulties, such as the inability to concentrate, sometimes some sleepy.But as the previous article said, our bodies first sleep when they're sleep-deprived, so lack of REM sleep doesn't seem like a big deal.But scientists have come up with a theory that we will absorb what we learned during the day during REM sleep.For example, babies spend a considerable amount of time sleeping, and 50 percent of their time is spent in REM sleep.So my guess is that lack of sleep leads to memory loss, and it may be that there is not enough time for REM sleep to digest the content of the day and lose a lot of information.To sum up, high quality sleep is actually easy to sleep, and stay at this stage for enough time.睡眠周期早期提到的睡眠周期，不僅是在充分睡眠期間進行一次。它們在睡眠中反復出現(xiàn)，我們稱之為睡眠周期。在睡眠周期中，我們從第一個到第五個重復多次。整個循環(huán)很復雜，大概是這樣。

在睡眠周期中，每個睡眠階段交替，如:1、2、3、4、3、2、REM、2、3、4、3、2、REM、2、3、4、3、2、REM、2、3、4、3、2、REM……每個周期平均需要60到100分鐘，但每個人都不一樣。

還有一些細節(jié):第一個睡眠階段是最長的，之后，睡眠階段會越來越短，最終會逐漸消失。第一個快速眼動睡眠階段是最短的，后期則更長。所以，半夜醒來的人越多。

與睡眠質(zhì)量相比，幾個階段的比例約為:第一階段為5%，第二階段為40%-50%，第三階段和第四階段為12%，REM階段為25%。

睡眠階段的重要性證明，如果我們睡眠不足，我們就會感到極度的困倦、惡心、頭痛、肌肉疼痛，以及白天無法集中注意力。當我們不規(guī)律地睡覺時，我們的身體會以犧牲其他睡眠階段為代價來支付睡眠。睡眠是第一階段的睡眠，我們的身體需要盡可能多的滿足，所以我們很少缺乏睡眠的這個階段。我們的免疫系統(tǒng)在睡眠和對抗疾病時被激活。這就是為什么我們在生病的時候會很困的原因，醫(yī)生建議我們在生病的時候盡可能多的躺在床上。

快速眼動睡眠階段的重要性雖然科學家還不清楚這一階段的目的，但研究表明，如果我們在白天缺乏快速眼動睡眠，我們會遇到一些困難，比如無法集中注意力，有時會感到困倦。但正如前一篇文章所述，我們的身體在睡眠不足的情況下才會第一次睡覺，所以缺乏快速眼動睡眠似乎并不是什么大問題。

但是科學家們提出了一個理論，我們將會吸收我們在REM睡眠期間所學到的東西。例如，嬰兒會花大量的時間睡覺，50%的時間用于快速眼動睡眠。所以我的猜測是睡眠不足會導致失憶，可能是因為沒有足夠的時間來進行快速眼動睡眠來消化一天的內(nèi)容，從而丟失大量的信息。

綜上所述，高質(zhì)量的睡眠實際上很容易入睡，并且在這個階段停留足夠的時間。