Telling lie is usually looked upon as an evil, because some people try to get benefit from dishonest means or try to conceal their faults. On the other hand,honesty is widely recognized as the best policy.
　　Parents always try to prove the benefits of being honest when you are a little child. A good story in this regard is .One day the child Washington chop down his farther‘ s favorite cherry tree; although knowing he would deserve to be punished, he told his father the truth. Unexpected, his farther apprised him rather than executing a punishment; moreover, he was encouraged to maintain the good manner all the time. As known to all, the honest boy eventually became one of the greatest presidents in American history.
　　However, telling lie,despite its negative effects, sometimes is essential in our daily life. First, the liar itself will benefit from the lie by escaping from the pressure of unnecessary embarrassment. On the other hand, the listener will feel more comfortable by reasonable excuses. For example, if a little girl‘s farther died in an accident, her mother would comfort her by saying" farther has gone to another beautiful land". In such cases, a lie with original goodwill is like a naught angel who might make the cruel nice. Furthermore, To some extent, the skills of telling lie can be regard as a capacity of creation and imagination.
　　Taking all those factors into consideration, we can definitely come to the conclusion that whether telling lie is harmful depends on its original intention and the ultimate result it will bring. If one is honest with oneself, one always learns from mistakes, can correct a concept or a hypothesis and work further, and reach the goal finally.
　　国防的重要性
　　As mass production is the core principle of industrial economy, mass destruction becomes the core principle of this age. Warfare, as the result of violence pushed to its utmost abounds, has been posing a great threat to all the nations for a long history.
　　First, although most of tax money goes into the national defense budget, an ounce of prevention is worth of a pound of cure. After the first-ever atom bomb dropped on the Japanese city on August 6,1945, more than 140,000 people were killed in the atomic blast and tens of thousands of others died from the after effects of radiation. Since then, the technique of battle systems has already gone through several generations.
　　On the other hand, despite the generally peaceful world, local wars and racial segregations never been disconnected. At the same time, business and governments constantly jockey for advantage over each other, sometimes relying on less-than-legal measures including warfare.
　　Furthermore, the computer terrorist can inflict damage on millions of people with a single keystroke, sowing fear, suspicion, and doubt. If the terrorisms in "9.11"used the atom bomb instead of aircraft, New York would had been destroyed to empty land. That is the reason why American never gave up his research in military might.
　　Of course, arguments will be raised against my standpoint. Some people criticize it on the grounds that these problems can be resolved through diplomacy and dialogue. However, in my opinion, the unavoidable Information Warfare will be waged because it can be. History clearly shows that any new technology, regardless of its original intentions, soon finds its way into the warriors. In conclusion, we, no matter individuals or governments, must prepare for the future we are creating.
　　In a world today of immense technology, increasing population and flourishing economic , investigations have shown that the global economy was outgrowing the earth‘s ecosystems. The whole industrial process which makes many of the goods and machines we need and use in daily lives, is bound to create a number of waste products which upset the environmental balance.
　　As mass production is the core principle of industrial economy, mass consumption and mass abandonment become the core principle in industrial age. Many of these waste products can be prevented or disposed of sensibly, but clearly while more and more new goods are produced and made more complex, there will be new wastes to be disposed of. The rise of wastes has led to an unparalleled debate between environmental protection and economic development.
　　However, they often ignore that the real victim of pollutions is not the citizen, because the rubbishes usually be gathered together and moved to an area far from the cities. As a result, in these areas the usable fields will be destructed, the air will be polluted, wild life, including both plants and animals will be put at risk, moreover, many inhabitants will be weaken on account of the waste despoil with poisonous materials from industrial companies.
　　Whatever its underlying effects, there is no doubt that much of the pollution could be controlled if only companies, individuals and governments would make more effort.
　　Globally, we can replace the automobile-based, fossil-fuel-centered, throwaway structure with a renewable-energy-based economy that reuses and recycles materials and has a stable population. Individuals, on the other hand, can help to solve by cutting out unnecessary buying,excess consumption and careless disposal of the products are use in our daily lives.
　　幸福是什么
　　Without any discussing, the key to happiness, in my opinion, is a harmonious relationship with the people in our lives.
　　It is the people in our lives who bring us the most happiness. Family, friends and co-workers, who are part of our inner circle, share our experiences, hopes and dreams, successes and frustrations, joys and pains. Too often, many of us get on the fast track of life and take each other for granted. As a new millennium approach, more people disregard their passion and interests and choose careers based on job security, pay and professional promotion. As a result, they find themselves isolated and without friends. Loneliness is a common tragedy that destroys lives.
　　Actually we were old enough to remember the old saying "Money doesn‘t buy happiness", yet we strive for the material objects and pay a high price. The essence of happiness is the unconditionally love we have for the people in our lives and their unconditionally love for us. To live life only for ourselves will bring us nothing but sadness and misery.
　　A self-centered life is an unhappy life. Selfishness is a major block to happiness. Our feelings of insecurity and low self-esteem cause us to be takers rather than givers. Our selfishness is often a mask for fear. If we don‘t think too much about ourselves, we have a lot of work to do in order to enhance our self-worth. We must live for something greater than ourselves. To be happy, we must get out of ourselves. An unhappy person must turn outward, not inward, to find happiness.
　　I truly believe that the happiest people are those who love many things. They love children, family and friends. They love sunrises and sunsets. They love life. They have even learned to love pain and despair rather than viewing them the opposite of happiness.