Lexical ExercisesExercise 1. Find the English equivalents for the words and word-combinations given below and use them in the sentences of your own.
самый распространенный металл; бокситы; добывать из; фтористое соединение; криолит; разлагать; хороший проводник электричества; предохранять металлы от ржавчины; поверхность; покрытие; понизить цену до.
Exercise 2. Match the English words and word combinations given below with their Russian equivalents. Use them in the sentences of your own.
1. it occurs naturally 1. в течение долгого времени 2. over long periods 2. они - ровесники 3. sugar-like 3. алюминиевая фольга 4. by coincidence 4. чистая окись алюминия 5. they are the same age 5. защищать металл от доступа воздуха 6. to seal a metal from 6. по случайному стечению обстоятельств the air (случайно) 7. aluminium foil 7. встречается в природе 8. pure aluminium oxide 8. похожий на сахар
Exercise 3. Answer the following questions
1. Where does aluminium occur naturally? 2. Was aluminium always a cheap metal? 3. What reduced the price of aluminium? 4. What are the properties of aluminium? 5. Is aluminium widely used and where?
Exercise 4. Paraphrase the following sentences using the words from the list given below.
1. Aluminium is drawn out from bauxite by the Bayer process. 2. We use aluminium to shield metals from corroding. 3. Aluminium is found mainly in bauxite. 4. Aluminium used to be a very dear metal before two chemists opened how to extract it using electricity. 5. Aluminium oxide encloses a metal securely from the air.
occur discover extract expensive protect seal
Exercise 5. Listen to the lecture and answer the questions.
1. Did the use of aluminium improve the quality of a large road bridge in Pennsylvania? 2. Why has aluminium been slow in progress? 3. What is necessary to reduce the price of aluminium? 4. What are the best qualities of aluminium?
Exercise 6. Translate at sight. What else do you know about aluminium?
1. Aluminium alloys can possess the strength of steel, though only a third the weight. 2. Cows give more milk when there are cool, heat-reflecting aluminium roofs on their dairy barns. 3. Aluminium offers a bright hope for energy conservation. 4. In direct contact with a heat source, aluminium is an excellent conductor. 5. World’s lightweight champion in the long-distance transport of electricity, aluminium, has virtually replaced heavier copper in high-voltage power lines. 6. Nearly indestructible, aluminium can be remelted over and over. 7. Aluminium is alloyed with small amounts of other metals. 8. Copper adds strength; magnesium imparts additional marine-corrosion resistance.
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