Many people think only professionals—engineers, accountants, teachers, etc.—have careers.{#blank#}1{#/blank#} Even if you've never had a paid job, you still have a career. Your career is the sum of your life and work. It includes all your activities and experiences. Your schooling, your volunteer work, and even your relationships with your family are all big parts of your career.{#blank#}2{#/blank#}

    During your career, you will have a variety of jobs, occupations and roles. People used to think of a job as full-time, permanent, paid work done for an employer at a work site. But in our changing world, a job is a set of duties or tasks. It can be paid or unpaid{#blank#}3{#/blank#} Even someone who is self-employed has a job.

    An occupation is a group of jobs with similar responsibilities that require a common set of skills.{#blank#}4{#/blank#} Programmers may have permanent or temporary jobs working for specific employers, be self-employed, work full-time or part-time, be paid for their work or volunteer their services. They may change jobs or hold several jobs at one time but, until they change the type of duties or tasks they perform, they are still computer programmers.

    {#blank#}5{#/blank#} We all play a number of roles in our lives and our roles often change over time. For example, Kris works four days a week as a receptionist in a clinic and takes evening courses in social work. She also sews gymnastic wear for her neighbor who sells it at summer markets. Now Kris has at least three roles.

A. A role is a part you play.

B. Actually everyone has a career.

C. In other words, your career is your life story.

D. For example, computer programmer is an occupation.

E. As a matter of fact, a job is different from a role in some way.

F. It can be completed at a work site, at home, or somewhere else.

G. The following is about your work, your family, and your life story.

    Steel is a hard metal that people use to make many different products. Car bodies, bridges, building frames, and containers are just a few of the things made from steel. {#blank#}1{#/blank#} But steel is better than iron in many ways. Steel is stronger but lighter than iron. Steel also lasts longer than iron.

    {#blank#}2{#/blank#}Then they add carbon to the liquid iron. They may also add other materials to make different types of steel. For example, steel with added chromium（铬）is called stainless steel. It will not rust（生锈）or stain. Finally, workers use machines to cool the liquid steel into bars or long sheets.{#blank#}3{#/blank#}

    People made the first steel as early as 1400 BC. Ancient people heated iron inside a pile of burning charcoal（木炭）. {#blank#}4{#/blank#}. The result was not the same as modern steel, but it was stronger than regular iron.

    In the 1800s people began to use huge ovens to make large amounts of steel. In the late 1800s builders used steel to make some of the first skyscrapers. {#blank#}5{#/blank#}. In the 1900s new processes made steel-making easier. Today steel remains one of the most popular building materials in the world.

A. This added carbon to the iron.

B. Steel is quite different from iron.

C. The hardened steel may then be made into products.

D. Steel is basically iron mixed with a little carbon.

E. Then they will be cooled and put on the market.

F. To make steel, workers hear iron until it melts.

G. They also used steel to make large, modern bridges.

    Asthma(哮喘) is a long-lasting breathing disease that affects millions of Americans, many of whom are children. People who get asthma will suffer from lack of breath, difficulty in breathing or coughing--which are caused by the tightening of the muscles in airways. Untreated asthma can lead to poor lung function and death, but asthma can also be effectively controlled with proper treatments.

    Research is discovering genes that contribute to the development of asthma. This development has pointed researchers to the role of indoor and outdoor pollution as environmental factors that contribute to the increased occurrence of asthma.

    The Indoor Pollution

    Indoor pollution has increased with the developments in building materials and in heating and air conditioning systems. In addition to poisonous gases that come from paint, other materials like dust and perfumes used in household products such as washing powder are recycled continuously through the house, winter and summer.

    Unlike the days before central heating or before whole-house air conditioning, these materials and chemicals cannot get out of modern homes. Most often, they cause breathing problems in the members of the family with the least-developed autoimmune(自身免疫的) systems. Proper venting (通风) and use of environmentally-friendly building materials and carpeting can help reduce the presence of these chemicals.

    The Out door pollution

    Researchers have also established outdoor pollution's role as a probable cause of asthma. Asthma has been proven to result from some fuel products. Smog and the small matters carried by it have been recognized as a factor which leads to asthma since the 19th century when London saw more and more diseases in the industrial population. Industrial pollutants and other chemicals which are produced in water treatment and open treated water like that found in the swimming pools also contribute to increased cases of asthma as well as other illnesses.

    Those most affected by the increase of industrial and environmental pollution are children. Although much has been done to control the levels of pollution in the US, there still remains much to do as it is a worldwide phenomenon. Until an international effort can be made to limit carbon emissions, the occurrence of environmental asthma will probably continue to increase.

    After a long day at work, coming home is a breath of fresh air. Home is a comfortable place to sit back and relax. {#blank#}1{#/blank#} Below are a number of things we can do to create a healthy home environment that will help to ease the workday stress and promote our physical and mental health.

    Cleaning the house regularly is the first thing we should do. It may seem like a tiring thing to clean but there is a reason for doing so. We can remove dust by cleaning the house. Leaving layers of dust everywhere means that there is a build-up of dust. And where do these layers of dust go?{#blank#}2{#/blank#}

    Making sure the rooms are full of sunlight is also important. We may not realize it but sunlight is an important part of our growth. We all know that sunlight promotes better working conditions. {#blank#}3{#/blank#} Think about using a Parans system where sunlight does not reach. This technology gathers the sunlight by using solar panels. It can send out sunlight wherever we are.

    {#blank#}4{#/blank#} Going green will help to remove toxins(毒素)in the air. They also give off oxygen, which can lower stress and improve our moods.

    Along the lines of being green, it can also be vital to think about what things we are bringing into the house. Try to avoid specific plastics that are harmful to health. {#blank#}5{#/blank#} They may contain poisonous chemicals that can be breathed in, or simple absorbed through the skin.

A. However, is it as healthy as it can be?

B. Is our home as comfortable as it used to be?

C. Into our lungs.

D. The same thing applies to certain carpets and paint.

E. Besides, it can reduce both stress and high blood pressure.

F. It is also a good idea to add more plants in our house.

G. It is acknowledges that a greener lifestyle is linked to better health.

    How do you prove you really are who you say you are? Maybe you have many ways to prove your identity: a birth certificate, a driver's license, a Social Security card, or a passport.

    But imagine that you are one of the one billion people in the world­most of them among the poorest­who have no official identification. No birth certificates. No official ID documents. Nothing. Without a way to prove who you are, you would face huge problems: going to school, seeing a doctor, getting a bank account...

    For the last decade, NandanNilekani has been working to make the world's invisible people visible by giving them access to official identification. One of India's leading technology experts, Nandan joined the government to lead the launch of India's national biometric ID system, which uses fingerprints and other biological characteristics to check the identities of the country's more than 1.3 billion residents. This ID system, known as Aadhaar (Hindi for "foundation"), is the world's largest biometric identification system and has become a valuable government platform for delivering social welfare programs and other government services.

    Now, Aadhaar has enrolled nearly all residents of India. With a trustworthy system to check identities of beneficiaries for everything from pensions to food moneies, the government has been able to save billions of dollars because of reduced cheating and dishonesty.

    Of course, India's ID system has not been without controversy. There were many privacy concerns, including criticism that the Aadhaar system was a mass monitoring tool and that personal data would be misused. Last year, a landmark decision by the Supreme Court of India found that the program did not violate the privacy rights of the country's residents. But in order to prevent misuse of personal data, the court placed tight limits on how the ID system could be used and shared.

    According to the latest data by the World Bank, there are one billion people in the world without an official proof of identity, including 45 percent of the population in sub­Saharan Africa and 17 percent of South Asia's population.

    Thanks to the work Nandan is doing, the world is moving closer to the day when everyone will have access to an official ID. The sooner we can achieve this goal, the sooner the world's poorest residents will not only be able to prove who they are, but also realize their dreams for better lives.