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Спереводом ) the metric system physics measures such physical quantities as time, length, mass, density, velocity, area, volume, temperature and energy. different units of length and mass exist. nearly all of them are interrelated. nowadays, three main systems of measurement are widely used: the british system of unity, the metric system of units and the international system of units (si with a few exceptions, all the nations of the world use the metric system. it is so easy that anyone who knows arithmetic can learn it quickly. before the introduction of the metric system (metre-kilogramsecond), the british foot-pound-second system was widely used. but the latter system (which is still in use in great britain and the usa) was very complicated and caused serious difficulties in the international trade. fox example, in the british system 1 mile is equal to 1760 yards, 1 yard – to feet and 1 foot – to 12 inches. this means that it's very difficult to convert units. but in the metric system each unit is a multiple of the following lower unit by ten. therefore, the conversion to a higher 11 quantity is done by moving the decimal point to the right to the required number of places, and vice versa. the idea of decimal system was realized only at the end of the 18th century. in 1791, the french academy of science decided that the standard of length should be one ten-millionth part of the distance from the equator to the north pole. the two french scientists charged with the task took this distance on a line running through paris and divided it into 10000000 equal parts. they called one of the parts a metre(‗measure‘), which became the main unit. metre was also used to measure area and volume. thus a square metre and a cubic metre appeared. the main advantage of the system is that for shorter measurements the metre is divided by ten, so a decimal system was used. shorter units had latin prefixes and longer ones – greek prefixes. so, ‗millimetre‘ is latin for ―a thousandth part of a metre‘ and ‗ kilometre‘ is greek for ‗ a thousand metres‘ as for the unit of mass, it was defined as the mass of a cubic centimeter of water at the temperature of 4°c (the temperature of its maximum density). as we know, the name of this unit is gramme. the si units is derived from the metric system and was internationally accepted in 1960. besides metre (m), kilogram (kg) and seconds (s), its basic units are kelwin (k), ampere (a), mole (mol), and candle (cd). this system was introduced in our country in the 1960s and every day we measure things by the units from this system.

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Shteinbakh
                                    Метрическая система.
   Физика измеряет такие физические величины, как время, длина, масса, плотность, скорость, площадь, объем, температура и энергия. Существуют различные единицы измерения длины и массы. Почти все они взаимосвязаны. Сейчас широко используются три главные системы измерения: Британская система единиц измерения, метрическая система единиц и международная (СИ). За некоторыми исключениями, все нации мира используют метрическую систему.  Она настолько проста, что ее могут изучить все, кто знает арифметику. До того, как была представлена метрическая система (метр-килограмм-секунда), широко использовалась английская система (фут-фунт-секунда). Но последняя система (которая до сих пор используется в Великобритании и США) была очень сложной и стала причиной затруднения международной торговли. Например, в британской системе 1 миля равна 1760 ярдам, 1 ярд - футу, а 1 фут - 12 дюймам, что означало трудности в переводе единиц. Но в метрической системе каждая единица представляет собой умноженную на 10 предыдущую единицу. Следовательно, преобразование в большее количество выполняется путем перемещения десятичной точки вправо до требуемого количества. И наоборот. 
   Идея десятичной системы была реализована только в конце 18 века. В 1791 году французская научная академия решила, что стандартной мерой длины должна быть десятимиллионная часть расстояния от экватора до северного полюса. Двум французским ученым была поручена задача взять это расстояние на линии, проходящей через Париж, и разделить его на 10 миллионов равных частей. Они назвали одну из частей метром, который стал главной единицей. Метр также использовался при измерении площади и объема. Таким образом появились квадратный метр и кубический метр. Главное преимущество системы в том, что для более мелких единиц измерения метр делится на 10, так же, как и в десятичной системе. Меньшие единицы имеют латинские суффиксы, а большие - греческие префиксы. Таким образом, "миллиметр" с латинского означает "тысячная часть метра", а "километр" с греческого - "тысяча метров".
   Что касается единицы массы, то она определялась как масса кубического метра воды при температуре 4 градуса по Цельсию (температура ее максимальной плотности). Как мы знаем, название этой единицы измерения - "грамм". 
   Единицы СИ взяты из метрической системы и были приняты во всем мире в 1960 году. Кроме метра, килограмма и секунды, основными единицами являются кельвин, ампер, моль и кандела (свеча). Данная система была представлена в нашей стране в 60-х гг XX века, и каждый день мы измеряем вещи единицами этой системы.
Shaubnatali
1. I would like to know if you could make it ___by___tomorrow.
2. He should come __within a few minutes.
3.She promised to call back ___in___ an hour.
4.The President will be in evidence ___before___ the Senate Committee.
5. We will know everything ___after___ he comes.
6.This contract will be confirmed ___in___ December.
7.There were two intervals ___during___ the performance.
8.__On__this occasion I would like to express my thanks.
9.There's an excellent restaurant at__ the end of the street.
10.___In___ the end everything was fine.
11. It didn't happen yesterday but the day __before yesterday.
12.I am ___at a___ loss, I don't know what to do.
13. The vocabulary seems to be easy ___at___ the beginning.
14.We wanted to hide __during a big storm.
15.On___ Christmas day our family eat carp. 
Tatyana_Minullina
OCA CA I Capital of Culture in Moscow. There are a lot of theaters and galleries. Center is located in Moscow Bolshoi and Maly Theatre, Moscow Art Theatre Opera. For every taste! In Moscow, there are places that really deliver a lot of joy to people. For example Old Circus Yuri Nikulin, which was opened in 1880. It worked Oleg Popov and Yuri Nikulin. It accommodates 2,000 spectators. It is possible to see tigers and elephants. Another famous place is the Moscow Dolphinarium. There are the dolphins, seals, fur seals. It is these places seem alive and less commercial.

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Спереводом ) the metric system physics measures such physical quantities as time, length, mass, density, velocity, area, volume, temperature and energy. different units of length and mass exist. nearly all of them are interrelated. nowadays, three main systems of measurement are widely used: the british system of unity, the metric system of units and the international system of units (si with a few exceptions, all the nations of the world use the metric system. it is so easy that anyone who knows arithmetic can learn it quickly. before the introduction of the metric system (metre-kilogramsecond), the british foot-pound-second system was widely used. but the latter system (which is still in use in great britain and the usa) was very complicated and caused serious difficulties in the international trade. fox example, in the british system 1 mile is equal to 1760 yards, 1 yard – to feet and 1 foot – to 12 inches. this means that it's very difficult to convert units. but in the metric system each unit is a multiple of the following lower unit by ten. therefore, the conversion to a higher 11 quantity is done by moving the decimal point to the right to the required number of places, and vice versa. the idea of decimal system was realized only at the end of the 18th century. in 1791, the french academy of science decided that the standard of length should be one ten-millionth part of the distance from the equator to the north pole. the two french scientists charged with the task took this distance on a line running through paris and divided it into 10000000 equal parts. they called one of the parts a metre(‗measure‘), which became the main unit. metre was also used to measure area and volume. thus a square metre and a cubic metre appeared. the main advantage of the system is that for shorter measurements the metre is divided by ten, so a decimal system was used. shorter units had latin prefixes and longer ones – greek prefixes. so, ‗millimetre‘ is latin for ―a thousandth part of a metre‘ and ‗ kilometre‘ is greek for ‗ a thousand metres‘ as for the unit of mass, it was defined as the mass of a cubic centimeter of water at the temperature of 4°c (the temperature of its maximum density). as we know, the name of this unit is gramme. the si units is derived from the metric system and was internationally accepted in 1960. besides metre (m), kilogram (kg) and seconds (s), its basic units are kelwin (k), ampere (a), mole (mol), and candle (cd). this system was introduced in our country in the 1960s and every day we measure things by the units from this system.
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