Giải pt: $x^{4}$ - $x^{3}$ - $12x^{2}$ - 7x +5 =0

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Mong mng giúp đỡ, mình cần gấp hiuhiu PART 4: You are going to read an article about tea. Choose from the list A—H the sentence which best summarizes each part (1—6) of the article. There is one extra sentence which you do not need to use. There is an example at the beginning (0). A. ‘Tea’ can be more than just a drink. E. Methods of making tea vary. B. There are reasons for its taste and appearance. F. There are some “do’s’ and ‘don’ts” to tea drinking. C. There is a confusing range to choose from. G. It is not easy to find a high quality cup of tea. D. It is considered by many to be a luxury H. Tea drinking has interesting origins. 0. H Tea was first drunk many centuries ago by the Chinese. The story goes that some leaves from a tea bush fell by chance into the boiling water in a philosopher’s pot. In the past, tea was affordable only by the rich, because of the high cost of importing it. Wealthy households would lock it securely away in sturdy tea chests to prevent theft. 1. It is estimated that on average, Britons drink per capita five cups of tea per day. Some would complain, though, that it is becoming increasingly hard to get a decent cuppa. Many cafes and restaurants serve up a lukewarm and tasteless liquid, and many British homes have adopted the more convenient tea bag, in preference to brewing loose tea leaves in a pot. 2. There are many ways of making and drinking tea, depending where you come from, and each person will tell you that their way is the only correct one. In the north of England, the tea goes into the cup, followed by the milk. In the south, it is the other way round. On the Continent you are likely to be served lemon, rather than milk with your tea, and in the East you may find a touch of a spice such as cardamom added. 3. There is an almost bewildering variety of teas available nowadays, both in loose leaf and bag form. Teas from India tend to be strong and dark, while those from China are more delicate and lighter. Earl Grey is pale with a gentle perfume by many to be the most and considered sophisticated cup. 4. There are some well known conventions to tea drinking. For example, dipping a biscuit into your cup is considered common, as is drinking from the saucer, or blowing on hot tea to cool it. And particular situations require a cup of tea — when someone is feeling tired or unwell, has received some bad news or a nasty surprise, it is often the first comfort offered. 5. The bitterness and colour comes from the tannin (also found in red wine), and oils are added to give subtle flavours. Tea is good news for weight watchers; a cup without milk or sugar added has only four calories. Perhaps surprisingly though, tea has twice the caffeine content of coffee, which accounts for its stimulating effect. 6. This doesn’t mean that a cup of tea can’t be the perfect accompaniment to something far more indulgent. Just over 150 years ago, the tradition of taking afternoon tea began. Sandwiches and cakes are served with a pot of tea, an occasion to bring out the best china and silver spoons. High tea is a meal in itself, with bread and butter, cold meats and a generous helping of cakes. The famous cream tea, from the west of England, comes with warm scones, jam and the local thick clotted cream.