Контрольная по английскому

Задание 1. Прочтите, перепишите предложения, переведите на русский язык.
1.    The main problem is to examine this substance.
2.    He is sorry to nave been late.
3.    He was the first to examine this material.
4.    To establish the molecular weight of oxygen means to find the number of atoms in the oxygen molecule.
5.    Where is the mixture to be heated?

Задание 2. Прочтите, перепишите и переведите  предложения, обращая внимание на обороты с инфинитивом.    
1.    This scientist thinks laser light, to be different from ordinary light.    
2.    This question is supposed to be solved soon.
3.    It is useful for you to read this book.
4.    This element has been discovered to be very useful.
5.  Water proved to be a compound.

Задание 3. Прочитайте, перепишите, переведите предложения, содержащие союзы: "if", "unless".
1.    Unless this material is treated properly it will not be a good insulator.
2.    If water had been added to the mixture, more alcohol and' acid would have been formed.

Задание 4. Прочтите и переведите письменно на русский язык следующий текст.
Pollution
Pollution is known to be of great concern to both science, industry and to humanity as a whole.
There has always been pollution, even when man was not present. When man appeared on earth, he added much to the pollution. As the  population of Earth increased, pollution increased too, it was increased in three ways; through the numbers of persons, through the industrial activity, and through man's use of devices such as automobiles that cause pollution. One of the most important tasks to be solved is air pollution. The study of pollution is assumed to be devided into three main parts: pollution of air, of water and of the land mass. It is very important for man to study this problem.
Every smoking chimney appears to be a source of air pollution. The use of natural gas or oil that have a negligible mineral content is believed to be of great help in reducing pollution.
The chief atmospheric gaseous pollutants originating from the earth's surface appeared to be oxides of sulphur, oxides of nitro¬gen, incompletely burned hydrocarbons  and carbon monoxide.
These gases are known to react with energy from sunlight to produce photochemical smog which can also cause extensive damage to vegetation.
It has been found that some  chemical processes, such as the manufacture of lime, cement steel tend to give off much dirt.
Lead, bromide and chloride emitted from the exhausts of cars which burn lead-containing gasoline produce a lead-chloride-bromi¬de aerosol which is considered to be a common air contaminant in urban areas.
There are many problems to be solved concerning the pollution of air.

Задание 5. Переведите вопросы на русский язык и ответьте на них, используя текст.
1.    What can cause pollution now?
2.    What chemical processes are connected with pollution?
3.    What are the chief atmospheric gaseous pollutants?

Задание 6. Переведите предложения на английский язык, используя текст.
1.    Промышленная деятельность человека увеличивает загрязнение природы.
2.    Необходимо изучить все источники загрязнения.
3.    Известно, что смог может нанести серьезный ущерб растительности.