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Complete. Light and shade
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Complete the text. Light is a that propagates in a line in all directions. We can experiment with the production of using a light source and an extended light source. In a point light source, we see…
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Mountain landscapes
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Mountain landscapes Mountains are high elevations of land. A mountain has three parts: The peak is the highest part of the mountain. The foot is the bottom part of the mountain. The slopes are the parts…
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Air and maritime transport
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7.1. Air transport Air transport is the most suitable form of long-distance travel. It is good for the transport of people and lightweight, perishable or valuable goods and is a fast and safe means of…
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Answer true or false
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Answer true or false: The press is a form of personal communication that allows us to talk to a person in a different place. → If you want to send someone an email, you both need an email address.…
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Complete. The lord's taxes
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Complete these sentences about the lord's taxes with the missing words: The were forced to pay the lord taxes in the form of a part of the from the land they worked. Once a year, they were also…
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The new constitutional and autonomic state
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2.1. The 1978 Constitution The Constitution was approved in Congress and the Senate and presented in the form of a referendum. The Spanish people voted it into law on 6th December 1978. The Constitution…
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Rocks and soil on the Earth's surface
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Types of rocks The Earth's crust is made up of three types of rock: igneous, sedimentary and metamorphic. Igneous rocks are formed when magma (a rock in a liquid state) cools. If the magma reaches…
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True / False. Lenses
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Are these sentences true or false? Lenses are pieces of glass or plastic in the form of a disc. They reflect light. Lenses are pieces of glass or plastic in the form of a disc. They use refraction to…
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Grammar - Go back to the text
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Countable and Uncountable Nouns Some nouns in English are countable. They have a singular and plural form. For example: an island → islands (noun + -s regular plural) a man → men (irregular plural)…
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Opposition to the state
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We want freedom and we believe that its existence is incompatible with the existence of any power, whatever its origin and form. (...) Evil, in the eyes of anarchists, is not in the form of government.…
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