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Hòa tan hoàn toàn một lượng bột Fe3O4 vào một lượng dd HNO3 vừa đủ thu được 0,336 lít khí NxOy ở đktc. Cô cạn dung dịch thu được sau phản ứng thu được 32,67 gam muối khan. Công thức của NxOy và khối lượng Fe3O4 trong hỗn hợp là
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giúp với !!! VII.Read the following passage and mark letter A, B, C, or D to indicate the correct word that best completes each blank. (14) ............ the United States, many adults and children (15) ............ overweight. Some people eat too much food at meals. They also eat snacks between meals. Sometimes people eat healthy things like fruit or vegetables (16) ............ many Americans eat a lot of junk food such as cookies, candies and potato chips. Eating junk food can make people gain weight. People also gain weight because they don’t get enough exercises. People need to walk, run, ride bicycles, or walk out in health clubs and gyms. When people exercise, they feel good and have more energy. A good diet and exercise will help you live along and healthy life. 14.A. On B. In C. At D. From 15.A. is B. was C. were D. are 16.A. but B. because C. although D. so that VIII.Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions that follow. 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 not only 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 are all aware that smoking is bad. So why do people smoke? 17.The number one cancer among men is____________. A. tongue cancer B. throat cancer C. lung cancer D. mouth cancer 18.The main cause of mouth cancer, tongue cancer and throat cancer is__________. A. drinking B. overeating C. breathing D. smoking 19.Every year, smoking causes about one million____________. A. cancer patients B. killing diseases C. early deaths D. injured men 20.The word “it” in the passage refers to____________. A. cancer B. smoke C. air D. breath 21. Who are more likely to have lung cancer and lung problems? A. People who live in the city B. People who live with smokers. C. People who live with non-smokers. D. People who live in the country IX. Mark letter A, B, C or D to indicate the sentence that is closest in meaning to the given one. 22.We don’t go on holiday because we do not have enough money. A.We do not have enough money, so we don’t go on holiday. B. Although we don’t have enough money, we go on holiday. C. We don’t have enough money, but we go on holiday. D. Although we have enough money, we don’t go on holiday. 23: “I’m leaving here for London tomorrow.” Mary said. A. Mary said that she would leave here for London the next day. B. Mary said that she would leave there for London the next day. C. Mary said that she was leaving there for London the next day. D. Mary said that she is leaving there for London the next day. 24.China is the largest country in Asia. A. No other country in Asia is as large than Chinese. B. No other country in Asia is as large as Chinese. D. China is as large as other countries in Asia. 25. I haven’t seen him for 3 years. A. I don’t see him for 3 years. B. I last saw him 3 years ago. C. I haven’t seen him since 3 years D. I won’t see him in 3 year

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