学习啦 媛媛 2019-05-16 10:35:29
smoking is a greater cause of death and disability than any single disease, says the world health organisation.
according to their figures, it is responsible for approximately five million deaths worldwide every year.
tobacco smoking is a known or probable cause of approximately 25 diseases, and even the who says that its impact on world health is not fully assessed.
heart attack and stroke
uk studies show that smokers in their 30s and 40s are five times more likely to have a heart attack than non-smokers.
tobacco contributes to the hardening of the arteries, which can then become blocked and starve the heart of bloodflow, causing the attack.
often, smokers who develop this will require complex and risky heart bypass surgery.
if you smoke for a lifetime, there is a 50% chance that your eventual death will be smoking-related - half of all these deaths will be in middle age.
smoking also increases the risk of having a stroke.
another primary health risk associated with smoking are lung cancer, which kills more than 20,000 people in the uk every year.
us studies have shown that men who smoke increase their chances of dying from the disease by more than 22 times.
women who smoke increase this risk by nearly 12 times.
lung cancer is a difficult cancer to treat - long term survival rates are poor.
smoking also increases the risk of oral, uterine, liver, kidney, bladder, stomach, and cervical cancers, and leukaemia.
another health problem associated with tobacco is emphysema, which, when combined with chronic bronchitis, produces chronic obstructive pulmonary disease.
ladies and gentlemen,
i have had a lot of teachers in my school who have given me much help in my study. for their help i will never forget them. but today i am going to talk about a special teacher of mine. this teacher is not a human being and its name is“computer”. it has been teaching me a lot of knowledge and i appreciate it very much.
with the development of modern science and technology, computers are widely used in every teritories (1) including education. how can a computer be my teacher? how does a computer teach me? multimedia(多媒体)helps a lot in this aspect in recent years, and computer-based training (cbt) has become a popular educational medium (手段). even before the multimedia come (2) up, many different learning systems appeared, using the components and techniques we now associate with the term “multimedia”. multimedia components, such as graphics (动画) , animations , sound and video, make the learning process easier through visualization. animations can present many complex subjects dynamically, but human teachers can not do this on blackboards.
multimedia makes our study more lively and interesting. for example, a cd-rom disk named “encarta encyclopedia” contains 650 mb
information including images, graphics, music clips, video clips,
animations , texts, hotwords, and database search functions. fields involved includes physical sciences, performance arts, social
sciences, politics, military, education and so on. when pressing a button, i can hear american president clinton's speech clip. i may enjoy playing all kinds of musical instruments in the world. i can also see the animation of many physical phenomena. this makes
physical concept to be understood deeply (3). the audio features of multimedia can greatly help me learning (4) foreign languages. with its speech output capabilities, i'm no longer dependent on an instructor for proper pronunciation.
how can i interact with a computer? there are many ways,
including keyboard, mouse pointer, and touch screen. i often use a
keyboard. when i press right keys, i can see and hear whatever i want. information world is at my fingertip. i wish that true speech input-output system would be invented one day.
as teachers, computers have a lot of virtues： they are positive, they have good memories and never lose any information stored in them. they have much knowledge in every field. they can let out all kinds of sounds, and can also improve the efficiency of our study. for example, if i want to, i can skip some chapters so that i can study at my own pace.
As everyone knows,English is very important today.It has been used everywhere in the world.It has become the most common language on Internet and for international trade. If we can speak English well,we will have more chance to succeed.Because more and more people have taken notice of it,the number of the people who go to learn English has increased at a high speed.
But for myself,I learn English not only because of its importance and its usefulness,but also because of my love for it.When I learn English, I can feel a different way of thinking which gives me more room to touch the world.When I read English novels,I can feel the pleasure from the book which is different from reading the translation.When I speak English, I can feel the confident from my words.When I write English,I can see the beauty which is not the same as our Chinese...
I love English,it gives me a colorful dream.I hope I can travel around the world one day. With my good English, I can make friends with many people from different contries.I can see many places of great intrests.I dream that I can go to London,because it is the birth place of English.
I also want to use my good English to introduce our great places to the English spoken people,I hope that they can love our country like us.
I know, Rome was not built in a day. I believe that after continuous hard study, one day I can speak English very well.
If you want to be loved, you should learn to love and be lovable. So I believe as I love English everyday , it will love me too.
I am sure that I will realize my dream one day!
The power of self-confidence is not to be underestimated, however, confidence is not everyone have, people with low self-esteem will not have it, if we are confident, that is not confident, but arrogance. So, confidence also wants moderate, should not be too.
People with low self-esteem is not successful, because they are afraid of difficulties, fear of the unknown dangers, think you what all can't, no, in fact they are wrong, this is the result of their lack of confidence, things did not difficult, as they think they are not as useless as they want. As long as they look ahead, give yourself a little more encouragement, and say to myself: I can do it! Don't be afraid in front of the unknown is difficult, only go forward, never fear, self-confidence will come to your side.
At any time, all want to learn self-confidence, frankly, smile in the face of all, doing everything to an unyielding, don't give up easily, say to yourself: I can do it! Self-confidence, power is endless, let us smile confidently towards our own success.
Confidence, in a broad sense, comprises self-trust,self-esteem, courage and indomitability.
This definition,though somewhat vague and unsubstantial, can be appreciated through experience because iff our lifetime, we are always seeking to achieve something successful and are always longing.
To attain a glorious goal, which can only be reached with the spirit of self confidence.
As is known, self-confidence is accompanied by will, and that as a twin, offers hope.
Those who do not have a strong will often think themselves unable to carry out any thorny tasks, while those who have do not find the tasks unsurmountably difficult.
In fact, when our heart is void of selfconfidence, every hope is gone, every thing on which we put our hands seems to be veiled in dark.
For instance, according to experts, every year in the entrance examinations of all kinds, fully-prepared candidates lose nearly 5% to 10% of the full scores, and consequently meet their Waterloo simply because they underestimate their own abilities, on the one hand,and overestimate possible difficulties on the other.
As a result, their fear to meet new challenge leads to helplessness in the examination.
Self-confidence can be regained (if you have ever lost it) by building faith in yourself.True,whatever you do, you will encounter hardships.
Put success Will come to you if you are courageous enough to strive for it. If you are not, failure might be your life-companion.