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Đọc bài đọc dưới đây và trả lời câu hỏi. Bill Gates is a very important person in the computer industry. He has been chief executive officer of Microsoft Corporation for several years. He is also the richest person in the United States. How did he do it? He learned a lot from his parents. While Bill was going to school, his father went to college, got a degree, and became a successful lawyer. From this, Bill learned that you have to work hard if you want something. His mother was a very busy teacher, but she also enjoyed going to parties. From this, he learned something else: If you want to work hard and play hard, you have to make a schedule. When Bill was young, he spent a lot of time alone. While most of his friends were playing, Bill read all of the World Book Encyclopedia and finished it when he was 8 years old. Bill’s childhood was not air work, however. He used to play a lot of sports - swimming, water-skiing, tennis. He was very serious about sports. He loved winning and he hated losing. When Bill got older, he spent more and more time working - and playing - on a computer. Before he was 20, Bill developed the world’s first computer language for the personal computer. Once when he was thinking about the future, he realized something important. He thought that every home was going to have a computer, and every computer would need software - his software. He said, ‘I’m going to make my first million dollars on software by the time I’m 25.’ And he did! Who is Bill Gates?

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Đọc bài đọc dưới đây và trả lời câu hỏi. Flood stands amongst the most devastating natural catastrophes. Almost everyone is well aware of its negative impacts on human such as loss of human life, damage to property, destruction of crops, loss of livestocks, and deterioration of health conditions owing to waterborne diseases. However, flood can also have some positive impacts on the environment. In many natural systems, floods play the key role in maintaining the ecosystem functions and biodiversity. They link the river with the land surrounding it, recharge ground water systems and fill wetlands. Moreover, floodwater often carries both sediment and nutrients, so it helps enrich the land. For many species, flood trigger breeding events, migration, and dispesal. The environmental benefits of flooding can also help the economy through things such as increased fish production, recharge of groundwater resourses, and maintainance of recreational environments. While cycling of sediments and nutrients is essential to a healthy ecosystem, too much sediment and nutrient in a waterway lowers the downstream water quality. Other negative effects include loss of habitat, dispersal of weed species and the release of pollutants such as chemicals, heavy metals and debris. These can degrade aquatic habitats, lower water quality, reduce coastal production, and contaminate coastal food resources. What does the passage mainly discuss?

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