Articles
The indefinite articles (a, an) are used with countable nouns when they are singular (a metal, an element). The definite article (the) may be used with plural nouns and with either countable or uncountable single nouns: - to specify something that has been already mentioned: The elements, I have mentioned, are very active. - To refer to something that is unique: a planet - the earth - To express superlatives: the heaviest element - With ordinal numbers: the twenty-first century; the last paper - With a noun that is followed by an of phrase: the atomic number of oxygen
Exercise 1. Explain the use of the articles or their absence.
Exercise 2. Fill in the spaces with articles whenever necessary.
1.... iron occurs only sparingly in... free state. 2. In... distant times... Caucasus was probably connected with... Balcans. 3.... United States of America is located on... American continent. 4.... Manhattan lies at.... mouth of... Hudson River. 5. They went to... Swiss Alps for... Christmas holidays. 6. I like... tea, but she prefers... mineral water. 7.... ancient Greece and Rome were known for their excellent metal workers. 8. She has just returned from... Hague. 9. I don’t know where... Cape of... Good Hope is.... Geography is not my best subject. 10.... Doctor Albert Arnott, who is a nuclear physicist, does not have much administrative work to do though he is... Head of Department of... Atomic Physics at Cambridge. He has... very good assistant. 11. When I was in... London I liked to walk in... Trafalgar Square. 12.... body at... rest tends to remain at... reat, and... body in... motion tends to remain in... motion. 13.... Browns are my neighbours. 14.... Guardian is among... most popular British newspapers. 15. He stood by... window of... sitting-room which overlooked... Hyde Park. 16.... capital of... United States, Washington, D.C., is not located in any state, but lies between... states of Maryland and... Virginia. 17.... future of... British education depends on... success of... radical reforms of... present Government. 18.... Britain was... rural country until... end of... 18th century. 19. … effect of radiation on … living things depends on … amount of radiation absorbed and … rate of absorption.
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