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下列关于计算机病毒的叙述中，正确的是______。
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Research has taught us a lot about job satisfaction and the motivation of workers. First, workers are more motivated if their job offers a sense of community. A sense of community grows when workers get recognition for their accomplishments and when they believe their skills are being well used. Social organization in the workplace is important. Supervisors and co--workers have a tremendous influence on job satisfaction. When workers are asked what they like or do not like about their job, around 80 percent will mention the people they work with. Second, while workers value traditional economic incentives such as pay and promotions, they also have needs and expectations that go beyond economic concerns. Workers need a sense of security in the workplace. Security comes from confidence in the system that they are part of, the quality of the product or service they provide, and the reputation of the company. Security comes from the personal satisfaction of knowing that their skills are being utilized in a way that contributes to the company’s success. Third, the most satisfying jobs are those with a high level of autonomy, in which employees can make their own decisions about the pacing and sequence of work with minimal supervision. Job autonomy is most often found in high-pay and high-prestige occupations. In jobs in the middle or lower levels of pay and prestige, workers generally have less autonomy. The lower the occupational status, the more heavily supervised the workers are, and the fewer decisions they can make on their own. Now listen to the recording. When you hear the question, begin your response. You may look at the reading passage during the writing time. Summarize the points made in the lecture, being sure to explain how they support specific points made in the reading passage.
在所列出的：1．字处理软件，2．Linux，3．UNIX，4．学籍管理系统，5．Windows XP和6．Office 2003，6个软件中，属于系统软件的有______。
Read the passage and answer the question below. Then listen to the recording and answer the rest of the questions. The discovery of penicillin and other antibiotic drugs was the most dramatic medical development of the twentieth century. These new drugs quickly became known as "wonder drugs" because of their ability to cure major forms of bacterial infection quickly and completely. Antibiotics made it possible for hospital patients to survive during and after surgery. No longer did patients have to depend largely on their body’s own immune system to fight off infections. These infections could be attacked directly with antibiotics. Antibiotics have given the medical profession powerful tools to fight a wide range of specific diseases. The development of antibiotics in the 1930s rested on the belief in the existence of certain chemicals that had the power to destroy specific microorganisms without injuring the human body at the same time. Advances in chemistry and in the study of bacteria quickened the discovery of such chemical wonders. The development of penicillin in the 1940s laid the foundation for even more powerful weapons against specific diseases. Since that time, researchers have identified hundreds of antibiotic substances that are effective against one or another type of bacteria. Among the most spectacular effects of antibiotics are reductions in the number of deaths from pneumonia and tuberculosis. Penicillin, one of the earliest of the wonder drugs, is a highly successful cure for pneumonia. Just ten thousand units of penicillin four times a day will be enough to cure bacterial pneumonia in most patients. Another important antibiotic is streptomycin, which is potent against tuberculosis. As a result, tuberculosis is no longer the life-threatening illness it once was. 1. What is the main idea of the passage What points support the main idea Now listen to the recording. Take notes on the important information. Summarize the points made in the lecture, being sure to explain how they cast doubt on specific points made in the reading passage. 2. What are the major points made in the lecture 3. How do the key points in the lecture cast doubt on specific points in the reading
心包积液的特征为
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