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chichun13012002
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Coal, oil, and natural gas supply human being with most of its power. However, not only are supplies of these fuels limited, but they are a major resource of pollution. Therefore, it’s important to improve, explore and develop such alternative energy sources as nuclear, water, solar, and wind power. Each of these alternatives, however, has advantages and disadvantages. Nuclear power factories efficiently produce large amount of electricity without polluting the atmosphere; however, they are costly to build and maintain, and thy are the difficult problem of what to do with nuclear waste. Hydroelectric power in expensive and environmentally safe, but impractical for communities located far from moving water. Wing power is pollution-free source of renewable energy but it cannot be used in many parts of the world where there is insufficient wind. Solar power is renewable, it does not cause pollution and it does not add the earth’s heat load. However, it is difficult to collect and store. Solar power also requires expensive equipment. 1. Coal, oil and natural gas are pollution-free sources of energy. 2. Hydroelectric power is expensive and always available everywhere. 3. Wind power doesn’t pollute the environment. 4. Solar power is never completely used up. B. Choose the best answer: 5. Nuclear power factories ………. A. are difficult to build B. pollute the atmosphere C. are very cheap to maintain D. create the problem of nuclear waste 6. What is the advantage of these alternatives ? A. They are environmentally friendly energy sources B. They are non-renewable forms of energy C. They are all very practical D. They are inexpensive to exploit

Smoking causes lung cancer, which is the number one cancer among men. Ninety percent of the people who get lung cancer die. Smoking is also the leading cause of mouth cancer, tongue cancer and throat cancer. Many smokers have heart disease and pneumonia. Smoking causes one million early deaths in the world every year. Smokers do not only do harm themselves but also harm others. Smokers breathe smoke out into the air. They breathe it out on their children and their wives or husbands. Children whose parents smoke have more breathing and lung problems than other children. Women who are married to smokers are more likely to have lung cancer than those married to non-smokers. We all aware that smoking is bad. So why do people smoke? 1. The number one cancer among men is lung cancer. 2. The main cause of mouth cancer, tongue cancer, throat cancer is drinking. 3. Smokers only do harm to others not themselves. 4. Every year, smoking causes about one million early deaths. B. Choose the best answer: 5. What is the main idea of this passage? A. The reason why people smoke. B. How to give up smoking. C. The bad effect of smoking. D. Parents shouldn’t smoke. 6. The word “it” in line 6 in the passage refers to ………………. A. cancer. B. smoke. C. air D. breath

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