Chemical pesticides are used in nearly all farming operations undertaken in developed countries. How...: ответ на тест 1006925 - Английский язык

Chemical pesticides are used in nearly all farming operations undertaken in developed countries. However, increasing concern over the harmful effects that pesticides may have on the environment has led to the use of alternative forms of pest control. For example, farmers use crop rotation to prevent pests that feed on a certain crop. Also, certain pests are controlled by introducing an organism that damages or kills the pests, but leaves the crops unharmed. Finally, some crops are being genetically engineered to be more resistant to pests.
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Some crops are being genetically engineered to be more resistant to …

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Chemical pesticides are used in nearly all farming operations undertaken in developed countries. However, increasing concern over the harmful effects that pesticides may have on the environment has led to the use of alternative forms of pest control. For example, farmers use crop rotation to prevent pests that feed on a certain crop. Also, certain pests are controlled by introducing an organism that damages or kills the pests, but leaves the crops unharmed. Finally, some crops are being genetically engineered to be more resistant to pests.
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Some crops are being genetically engineered to be more resistant to …

Do you like tomatoes? Although people generally think of and use the tomato as a vegetable, in fact it is not one. It’s a fruit.
People in Central America have been eating tomatoes for many thousands of years. However, it was not until the Spanish arrived in Mexico in the early 1500s that tomatoes came to Europe. Before that, no one in Europe had ever seen a tomato! When tomatoes first appeared in Italy and Britain, many people were scared. Tomatoes were thought by many people to be poisonous. They refused to eat them and grew tomatoes only as plants for decoration. Since then, the tomato has become extremely popular. Can you imagine what food today would be like without it?
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Building materials are very important in the construction. But it is more important for any designer to select and adapt such building materials of construction that will give the most effective result by the most economical means. In this choice of materials for any work of constructions many factors must be considered by the civil engineer. These factors include availability, cost, physical properties of materials and others.
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Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.
The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable (can be deformed and bent without fracture) and ductile (can be drawn into wire). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.
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Architecture is the art which makes buildings beautiful to look at as well as useful. A man who designs buildings and makes the plans for them is called an architect. He has to think not only of what he wants the building to look like when it is finished, but also what it is to be used for. He must not forget the sort of material to be used in the building. This may be stone, brick, wood or steel and concrete.
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